[Asterisk-code-review] channel.c: Fix segfault with Monitor(wav,file,i) (asterisk[13])

[Valentin Vidić]

Valentin Vidić has uploaded this change for review. ( https://gerrit.asterisk.org/10893


Change subject: channel.c: Fix segfault with Monitor(wav,file,i)
......................................................................

channel.c: Fix segfault with Monitor(wav,file,i)

If the Monitor is started with the i option the read_stream will be
NULL. One code path in channel.c checks if write_stream is set but than
uses read_stream instead causing a segfault.

ASTERISK-28249

Change-Id: I395b0975e4d38916cfbf65b4e91785450992307b
---
M main/channel.c
1 file changed, 2 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/93/10893/1

diff --git a/main/channel.c b/main/channel.c
index 74d7986..07b1521 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -5442,7 +5442,7 @@
 				if (jump >= 0) {
 					jump = calc_monitor_jump((ast_channel_insmpl(chan) - ast_channel_outsmpl(chan)),
 					                         ast_format_get_sample_rate(f->subclass.format),
-					                         ast_format_get_sample_rate(ast_channel_monitor(chan)->read_stream->fmt->format));
+					                         ast_format_get_sample_rate(ast_channel_monitor(chan)->write_stream->fmt->format));
 					if (ast_seekstream(ast_channel_monitor(chan)->write_stream, jump, SEEK_FORCECUR) == -1) {
 						ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
 					}
@@ -5453,7 +5453,7 @@
 #else
 				int jump = calc_monitor_jump((ast_channel_insmpl(chan) - ast_channel_outsmpl(chan)),
 				                             ast_format_get_sample_rate(f->subclass.format),
-				                             ast_format_get_sample_rate(ast_channel_monitor(chan)->read_stream->fmt->format));
+				                             ast_format_get_sample_rate(ast_channel_monitor(chan)->write_stream->fmt->format));
 				if (jump - MONITOR_DELAY >= 0) {
 					if (ast_seekstream(ast_channel_monitor(chan)->write_stream, jump - cur->samples, SEEK_FORCECUR) == -1) {
 						ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newchange
Gerrit-Change-Id: I395b0975e4d38916cfbf65b4e91785450992307b
Gerrit-Change-Number: 10893
Gerrit-PatchSet: 1
Gerrit-Owner: Valentin Vidić <vvidic at valentin-vidic.from.hr>
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