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core: Don't attempt to write to a stream that does not exist.

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When a frame is provided to ast_write ensure that a multistream
capable channel has a stream for it before attempting to give it
to the channel driver. In some cases (such as a deferred SDP
negotiation) the stream may not yet exist.

ASTERISK-27364

Change-Id: Icf84ca982a67cdd6e9a71851eb7eb1bd0e865276
This commit is contained in:
Joshua Colp
2017-11-02 05:37:48 -05:00
parent 64f1294ef2
commit 8701479386
1 changed files with 15 additions and 3 deletions
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main/channel.c
+15 -3
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@@ -5054,7 +5054,11 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
case AST_FRAME_VIDEO:
/* XXX Handle translation of video codecs one day XXX */
if (ast_channel_tech(chan)->write_stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), fr);
if (stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), fr);
} else {
res = 0;
}
} else if ((stream == default_stream) && ast_channel_tech(chan)->write_video) {
res = ast_channel_tech(chan)->write_video(chan, fr);
} else {
@@ -5063,7 +5067,11 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
break;
case AST_FRAME_MODEM:
if (ast_channel_tech(chan)->write_stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), fr);
if (stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), fr);
} else {
res = 0;
}
} else if ((stream == default_stream) && ast_channel_tech(chan)->write) {
res = ast_channel_tech(chan)->write(chan, fr);
} else {
@@ -5251,7 +5259,11 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
f = NULL;
} else {
if (ast_channel_tech(chan)->write_stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), f);
if (stream) {
res = ast_channel_tech(chan)->write_stream(chan, ast_stream_get_position(stream), f);
} else {
res = 0;
}
} else if ((stream == default_stream) && ast_channel_tech(chan)->write) {
res = ast_channel_tech(chan)->write(chan, f);
} else {