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avdevice/dshow: Check device_filter_unique_name before use

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Fixes: CID1591931 Explicit null dereferenced

Sponsored-by: Sovereign Tech Fund
Reviewed-by: Roger Pack <rogerdpack@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 175c191668)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-05-27 01:52:24 +02:00
parent d3b625a551
commit d71876ec5c
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1 changed files with 1 additions and 1 deletions
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libavdevice/dshow.c
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@ -780,7 +780,7 @@ dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
if (ctx->device_filter[otherDevType]) {
// avoid adding add two instances of the same device to the graph, one for video, one for audio
// a few devices don't support this (could also do this check earlier to avoid double crossbars, etc. but they seem OK)
if (strcmp(device_filter_unique_name, ctx->device_unique_name[otherDevType]) == 0) {
if (!device_filter_unique_name || strcmp(device_filter_unique_name, ctx->device_unique_name[otherDevType]) == 0) {
av_log(avctx, AV_LOG_DEBUG, "reusing previous graph capture filter... %s\n", device_filter_unique_name);
IBaseFilter_Release(device_filter);
device_filter = ctx->device_filter[otherDevType];