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Checking data size in CaDescriptor::Parse() and LinkageDescriptor::Parse() of 'libsi' to avoid crashes with invalid data

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This commit is contained in:
Klaus Schmidinger 2006-02-18 11:08:55 +01:00
parent 5ed4504ce0
commit b8cdca858b
2 changed files with 11 additions and 3 deletions
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2
HISTORY
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@ -4334,3 +4334,5 @@ Video Disk Recorder Revision History
- Fixed some typos in the CONTRIBUTORS file (thanks to Frank Krömmelbein).
- Changed offset and size handling in 'libsi' from 'unsigned' to 'signed', so that
overflows can be better detected (thanks to Marcel Wiesweg).
- Checking data size in CaDescriptor::Parse() and LinkageDescriptor::Parse() of
'libsi' to avoid crashes with invalid data (thanks to Marcel Wiesweg).

12
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 1.16 2006/02/18 10:38:20 kls Exp $
* $Id: descriptor.c 1.17 2006/02/18 11:02:25 kls Exp $
* *
***************************************************************************/
@ -329,7 +329,10 @@ int CaDescriptor::getCaPid() const {
void CaDescriptor::Parse() {
int offset=0;
data.setPointerAndOffset<const descr_ca>(s, offset);
privateData.assign(data.getData(offset), getLength()-offset);
if (checkSize(getLength()-offset))
privateData.assign(data.getData(offset), getLength()-offset);
else
privateData.assign(NULL, 0);
}
int StreamIdentifierDescriptor::getComponentTag() const {
@ -635,7 +638,10 @@ void MultilingualServiceNameDescriptor::Name::Parse() {
void LinkageDescriptor::Parse() {
int offset=0;
data.setPointerAndOffset<const descr_linkage>(s, offset);
privateData.assign(data.getData(offset), getLength()-offset);
if (checkSize(getLength()-offset))
privateData.assign(data.getData(offset), getLength()-offset);
else
privateData.assign(NULL, 0);
}
int LinkageDescriptor::getTransportStreamId() const {