[FFmpeg-cvslog] libswresample: Prevent out of bounds.

[Eli Kobrin]

ffmpeg | branch: master | Eli Kobrin <kobrineli at ispras.ru> | Wed Aug  2 15:14:10 2023 +0300| [3e97d96e6f239894317fc6eb778b25ce67ce5451] | committer: Michael Niedermayer

libswresample: Prevent out of bounds.

We've been fuzzing torchvision with [sydr-fuzz](https://github.com/ispras/oss-sydr-fuzz)
and found out of bounds error in ffmpeg project at audioconvert.c:151.
To prevent error we need to fix checks for in and out fmt in swr_init.

Signed-off-by: Eli Kobrin <kobrineli at ispras.ru>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3e97d96e6f239894317fc6eb778b25ce67ce5451
---

 libswresample/swresample.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index 6dc329a9d0..fb3d7bccbf 100644
--- a/libswresample/swresample.c
+++ b/libswresample/swresample.c
@@ -196,11 +196,11 @@ av_cold int swr_init(struct SwrContext *s){
 
     clear_context(s);
 
-    if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
+    if((unsigned) s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
         return AVERROR(EINVAL);
     }
-    if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
+    if((unsigned) s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
         return AVERROR(EINVAL);
     }