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Fixed a possible deadlock in case two SVDRP clients send each other POLL commands at the same time

This commit is contained in:
Klaus Schmidinger 2022-11-19 15:49:27 +01:00
parent b14ed38a48
commit 83c9677899
2 changed files with 5 additions and 5 deletions
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2
HISTORY
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@ -9797,3 +9797,5 @@ Video Disk Recorder Revision History
- Added a warning if an attempt is made to obtain a write lock twice from the same thread.
- Fixed default values for DVB-T (thanks to Winfried Köhler and Jose Angel).
- Removed some unnecessary locks from SVDRPClientHandler.
- Fixed a possible deadlock in case two SVDRP clients send each other POLL commands
at the same time.

8
svdrp.c
View File

@ -10,7 +10,7 @@
* and interact with the Video Disk Recorder - or write a full featured
* graphical interface that sits on top of an SVDRP connection.
*
* $Id: svdrp.c 5.4 2022/11/19 15:47:03 kls Exp $
* $Id: svdrp.c 5.5 2022/11/19 15:49:27 kls Exp $
*/
#include "svdrp.h"
@ -2380,10 +2380,8 @@ void cSVDRPServer::CmdPOLL(const char *Option)
if (SVDRPClientHandler) {
if (ListName) {
if (strcasecmp(ListName, "timers") == 0) {
if (SVDRPClientHandler->TriggerFetchingTimers(RemoteName))
Reply(250, "OK");
else
Reply(501, "No connection to \"%s\"", RemoteName);
Reply(250, "OK"); // must send reply before calling TriggerFetchingTimers() to avoid a deadlock if two clients send each other POLL commands at the same time
SVDRPClientHandler->TriggerFetchingTimers(RemoteName);
}
else
Reply(501, "Unknown list name: \"%s\"", ListName);