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

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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: I1bae9126537be54895c7fea2d08dd9488d8cc525
This commit is contained in:
Valentin Vidic
2019-01-20 19:15:51 +01:00
committed by Corey Farrell
parent 011e46d5a6
commit 6506c5b1d4
1 changed files with 2 additions and 2 deletions
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4
main/channel.c
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@@ -5260,7 +5260,7 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
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");
}
@@ -5271,7 +5271,7 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
#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");