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Fixed a possible crash with inconsistent SI data

This commit is contained in:
Klaus Schmidinger 2004-10-16 10:14:19 +02:00
parent 6415cc900d
commit ac13b6e161
11 changed files with 61 additions and 50 deletions
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1
CONTRIBUTORS
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@ -687,6 +687,7 @@ Marcel Wiesweg <marcel.wiesweg@gmx.de>
for fixing a memory leak in NIT processing
for adding a few missing initializations
for adding play mode pmVideoOnly
for fixing a possible crash with inconsistent SI data
Torsten Herz <torsten.herz@web.de>
for fixing a possible deadlock when using the "Blue" button in the "Schedules" menu

1
HISTORY
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@ -3006,3 +3006,4 @@ Video Disk Recorder Revision History
testing regarding buffer performance and giving me some hints that finally led
to finding out that this was the basic problem causing buffer overflows).
- Improved Transfer Mode (thanks to Marco Schlüßler for suggestions and testing).
- Fixed a possible crash with inconsistent SI data (thanks to Marcel Wiesweg).

6
eit.c
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@ -8,7 +8,7 @@
* Robert Schneider <Robert.Schneider@web.de> and Rolf Hakenes <hakenes@hippomi.de>.
* Adapted to 'libsi' for VDR 1.3.0 by Marcel Wiesweg <marcel.wiesweg@gmx.de>.
*
* $Id: eit.c 1.96 2004/07/18 10:52:58 kls Exp $
* $Id: eit.c 1.97 2004/10/16 09:49:13 kls Exp $
*/
#include "eit.h"
@ -47,10 +47,8 @@ cEIT::cEIT(cSchedules *Schedules, int Source, u_char Tid, const u_char *Data)
bool Modified = false;
SI::EIT::Event SiEitEvent;
for (SI::Loop::Iterator it; eventLoop.hasNext(it); ) {
for (SI::Loop::Iterator it; eventLoop.getNext(SiEitEvent, it); ) {
Empty = false;
SiEitEvent = eventLoop.getNext(it);
cEvent *pEvent = (cEvent *)pSchedule->GetEvent(SiEitEvent.getEventId(), SiEitEvent.getStartTime());
if (!pEvent) {
// If we don't have that event yet, we create a new one.

14
libsi/descriptor.c
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@ -6,7 +6,7 @@
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: descriptor.c 1.13 2004/06/06 14:47:30 kls Exp $
* $Id: descriptor.c 1.14 2004/10/16 09:51:05 kls Exp $
* *
***************************************************************************/
@ -110,9 +110,7 @@ char *ExtendedEventDescriptors::getText(char *buffer, int size, const char *sepa
continue;
ExtendedEventDescriptor::Item item;
for (Loop::Iterator it; d->itemLoop.hasNext(it); ) {
item=d->itemLoop.getNext(it);
for (Loop::Iterator it; d->itemLoop.getNext(item, it); ) {
if (!separated && size > sepLen2) {
strcpy(buffer+index, separation2); // let's have a separator between the long text and the items
index += sepLen2;
@ -207,9 +205,7 @@ char *ExtendedEventDescriptors::getTextItemized(char *buffer, int size, const ch
continue;
ExtendedEventDescriptor::Item item;
for (Loop::Iterator it; d->itemLoop.hasNext(it); ) {
item=d->itemLoop.getNext(it);
for (Loop::Iterator it; d->itemLoop.getNext(item, it); ) {
item.itemDescription.getText(buffer+index, size);
len = strlen(buffer+index);
index += len;
@ -251,9 +247,7 @@ bool ExtendedEventDescriptors::getTextItemized(Loop::Iterator &it, bool &valid,
continue;
ExtendedEventDescriptor::Item item;
if (d->itemLoop.hasNext(it)) {
item=d->itemLoop.getNext(it);
if (d->itemLoop.getNext(item, it)) {
item.item.getText(itemDescription, sizeItemDescription);
item.itemDescription.getText(itemText, sizeItemText);
valid=true;

20
libsi/si.c
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@ -6,7 +6,7 @@
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: si.c 1.11 2004/06/06 14:43:56 kls Exp $
* $Id: si.c 1.12 2004/10/16 09:54:05 kls Exp $
* *
***************************************************************************/
@ -30,6 +30,10 @@ void Object::setData(CharArray &d) {
data=d;
}
bool Object::checkSize(unsigned int offset) {
return data.checkSize(offset);
}
Section::Section(const unsigned char *data, bool doCopy) {
setData(data, getLength(data), doCopy);
}
@ -50,15 +54,15 @@ int Section::getLength(const unsigned char *d) {
return HILO(((const SectionHeader *)d)->section_length)+sizeof(SectionHeader);
}
bool CRCSection::isValid() {
bool CRCSection::isCRCValid() {
return CRC32::isValid((const char *)data.getData(), getLength()/*, data.FourBytes(getLength()-4)*/);
}
bool CRCSection::CheckCRCAndParse() {
if (!isValid())
if (!isCRCValid())
return false;
CheckParse();
return true;
return isValid();
}
int NumberedSection::getTableIdExtension() const {
@ -102,7 +106,7 @@ DescriptorTag Descriptor::getDescriptorTag(const unsigned char *d) {
}
Descriptor *DescriptorLoop::getNext(Iterator &it) {
if (it.i<getLength()) {
if (isValid() && it.i<getLength()) {
return createDescriptor(it.i, true);
}
return 0;
@ -110,7 +114,7 @@ Descriptor *DescriptorLoop::getNext(Iterator &it) {
Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag tag, bool returnUnimplemetedDescriptor) {
Descriptor *d=0;
if (it.i<getLength()) {
if (isValid() && it.i<getLength()) {
const unsigned char *p=data.getData(it.i);
const unsigned char *end=p+getLength()-it.i;
while (p < end) {
@ -128,7 +132,7 @@ Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag tag, bool return
Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag *tags, int arrayLength, bool returnUnimplementedDescriptor) {
Descriptor *d=0;
if (it.i<getLength()) {
if (isValid() && it.i<getLength()) {
const unsigned char *p=data.getData(it.i);
const unsigned char *end=p+getLength()-it.i;
while (p < end) {
@ -147,6 +151,8 @@ Descriptor *DescriptorLoop::getNext(Iterator &it, DescriptorTag *tags, int array
}
Descriptor *DescriptorLoop::createDescriptor(int &i, bool returnUnimplemetedDescriptor) {
if (!checkSize(Descriptor::getLength(data.getData(i))))
return 0;
Descriptor *d=Descriptor::getDescriptor(data+i, domain, returnUnimplemetedDescriptor);
if (!d)
return 0;

30
libsi/si.h
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@ -6,7 +6,7 @@
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: si.h 1.10 2004/06/06 13:35:21 kls Exp $
* $Id: si.h 1.11 2004/10/16 09:58:10 kls Exp $
* *
***************************************************************************/
@ -180,12 +180,17 @@ public:
//can only be called once since data is immutable
void setData(const unsigned char*data, unsigned int size, bool doCopy=true);
CharArray getData() { return data; }
//returns the valid flag which indicates if data is all right or errors have been encountered
bool isValid() { return data.isValid(); }
virtual int getLength() = 0;
protected:
CharArray data;
//is protected - not used for sections
template <class T> friend class StructureLoop;
void setData(CharArray &d);
//returns whether the given offset fits within the limits of the actual data
//The valid flag will be set accordingly
bool checkSize(unsigned int offset);
};
class Section : public Object {
@ -205,7 +210,7 @@ public:
//convenience: sets data and parses if doParse
CRCSection(const unsigned char *data, bool doCopy=true) : Section(data, doCopy) {}
CRCSection() {}
bool isValid();
bool isCRCValid();
//convenience: isValid+CheckParse
bool CheckCRCAndParse();
};
@ -229,9 +234,9 @@ public:
class VariableLengthPart : public Object {
public:
//never forget to call this
void setData(CharArray d, int l) { Object::setData(d); length=l; }
void setData(CharArray d, int l) { Object::setData(d); checkSize(l); length=l; }
//convenience method
void setDataAndOffset(CharArray d, int l, unsigned int &offset) { Object::setData(d); length=l; offset+=l; }
void setDataAndOffset(CharArray d, int l, unsigned int &offset) { Object::setData(d); checkSize(l); length=l; offset+=l; }
virtual int getLength() { return length; }
private:
int length;
@ -281,29 +286,36 @@ template <class T> class StructureLoop : public Loop {
public:
//currently you must use a while-loop testing for hasNext()
//i must be 0 to get the first descriptor (with the first call)
T getNext(Iterator &it)
bool getNext(T &obj, Iterator &it)
{
if (!isValid() || it.i >= getLength())
return false;
CharArray d=data;
d.addOffset(it.i);
T ret;
ret.setData(d);
ret.CheckParse();
if (!checkSize(ret.getLength()))
return false;
it.i+=ret.getLength();
return ret;
obj=ret;
return true;
}
T* getNextAsPointer(Iterator &it)
{
if (getLength() <= it.i)
if (!isValid() || it.i >= getLength())
return 0;
CharArray d=data;
d.addOffset(it.i);
T *ret=new T();
ret->setData(d);
ret->CheckParse();
if (!checkSize(ret->getLength()))
return 0;
it.i+=ret->getLength();
return ret;
}
bool hasNext(Iterator &it) { return getLength() > it.i; }
//bool hasNext(Iterator &it) { return getLength() > it.i; }
};
//contains descriptors of different types
@ -385,7 +397,7 @@ public:
it.i+=sizeof(T);
return ret;
}
bool hasNext(Iterator &it) { return getLength() > it.i; }
bool hasNext(Iterator &it) { return isValid() && (getLength() > it.i); }
};
class MHP_DescriptorLoop : public DescriptorLoop {

6
libsi/util.c
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@ -6,7 +6,7 @@
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: util.c 1.3 2003/12/22 14:03:03 kls Exp $
* $Id: util.c 1.4 2004/10/16 09:58:41 kls Exp $
* *
***************************************************************************/
@ -88,9 +88,7 @@ CharArray CharArray::operator+(const unsigned int offset) const {
return f;
}
CharArray::Data::Data() : count_(1) {
size=0;
data=0;
CharArray::Data::Data() : data(0), size(0), count_(1), valid(true) {
/*
lockingPid = 0;
locked = 0;

9
libsi/util.h
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@ -6,7 +6,7 @@
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* $Id: util.h 1.3 2003/12/22 14:07:41 kls Exp $
* $Id: util.h 1.4 2004/10/16 09:59:48 kls Exp $
* *
***************************************************************************/
@ -58,6 +58,9 @@ public:
u_int16_t TwoBytes(const unsigned int index) const { return data_->data ? data_->TwoBytes(off+index) : 0; }
u_int32_t FourBytes(const unsigned int index) const { return data_->data ? data_->FourBytes(off+index) : 0; }
bool isValid() const { return data_->valid; }
bool checkSize(unsigned int offset) { return (data_->valid && (data_->valid=(off+offset < data_->size))); }
void addOffset(unsigned int offset) { off+=offset; }
private:
class Data {
@ -86,10 +89,12 @@ private:
const unsigned char*data;
unsigned int size;
unsigned count_;
// count_ is the number of CharArray objects that point at this
// count_ must be initialized to 1 by all constructors
// (it starts as 1 since it is pointed to by the CharArray object that created it)
unsigned count_;
bool valid;
/*
pthread_mutex_t mutex;

6
nit.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: nit.c 1.8 2004/06/06 14:24:49 kls Exp $
* $Id: nit.c 1.9 2004/10/16 10:00:27 kls Exp $
*/
#include "nit.h"
@ -92,8 +92,8 @@ void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
return;
if (!Channels.Lock(true, 10))
return;
for (SI::Loop::Iterator it; nit.transportStreamLoop.hasNext(it); ) {
SI::NIT::TransportStream ts = nit.transportStreamLoop.getNext(it);
SI::NIT::TransportStream ts;
for (SI::Loop::Iterator it; nit.transportStreamLoop.getNext(ts, it); ) {
SI::Descriptor *d;
for (SI::Loop::Iterator it2; (d = ts.transportStreamDescriptors.getNext(it2)); ) {
switch (d->getDescriptorTag()) {

8
pat.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: pat.c 1.9 2004/05/23 09:29:04 kls Exp $
* $Id: pat.c 1.10 2004/10/16 10:01:12 kls Exp $
*/
#include "pat.h"
@ -285,8 +285,7 @@ void cPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
return;
SI::PAT::Association assoc;
int Index = 0;
for (SI::Loop::Iterator it; pat.associationLoop.hasNext(it); ) {
assoc = pat.associationLoop.getNext(it);
for (SI::Loop::Iterator it; pat.associationLoop.getNext(assoc, it); ) {
if (!assoc.isNITPid()) {
if (Index++ == pmtIndex) {
pmtPid = assoc.getPid();
@ -332,8 +331,7 @@ void cPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
int Tpid = 0;
int NumApids = 0;
int NumDpids = 0;
for (SI::Loop::Iterator it; pmt.streamLoop.hasNext(it); ) {
stream = pmt.streamLoop.getNext(it);
for (SI::Loop::Iterator it; pmt.streamLoop.getNext(stream, it); ) {
switch (stream.getStreamType()) {
case 1: // STREAMTYPE_11172_VIDEO
case 2: // STREAMTYPE_13818_VIDEO

10
sdt.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: sdt.c 1.11 2004/07/18 11:14:42 kls Exp $
* $Id: sdt.c 1.12 2004/10/16 10:02:23 kls Exp $
*/
#include "sdt.h"
@ -39,9 +39,7 @@ void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
if (!Channels.Lock(true, 10))
return;
SI::SDT::Service SiSdtService;
for (SI::Loop::Iterator it; sdt.serviceLoop.hasNext(it); ) {
SiSdtService = sdt.serviceLoop.getNext(it);
for (SI::Loop::Iterator it; sdt.serviceLoop.getNext(SiSdtService, it); ) {
cChannel *channel = Channels.GetByChannelID(tChannelID(Source(), sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId()));
if (!channel)
channel = Channels.GetByChannelID(tChannelID(Source(), 0, Transponder(), SiSdtService.getServiceId()));
@ -110,8 +108,8 @@ void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length
*/
case SI::NVODReferenceDescriptorTag: {
SI::NVODReferenceDescriptor *nrd = (SI::NVODReferenceDescriptor *)d;
for (SI::Loop::Iterator it; nrd->serviceLoop.hasNext(it); ) {
SI::NVODReferenceDescriptor::Service Service = nrd->serviceLoop.getNext(it);
SI::NVODReferenceDescriptor::Service Service;
for (SI::Loop::Iterator it; nrd->serviceLoop.getNext(Service, it); ) {
cChannel *link = Channels.GetByChannelID(tChannelID(Source(), Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId()));
if (!link && Setup.UpdateChannels >= 3) {
link = Channels.NewChannel(Channel(), "NVOD", Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId());