[FFmpeg-cvslog] avcodec/sgidec: do not forget the number of components in read_uncompressed_sgi()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Jan 12 00:16:01 2023 +0100| [9f0602a717c3939529bfe49734f3d8029dc36625] | committer: Michael Niedermayer

avcodec/sgidec: do not forget the number of components in read_uncompressed_sgi()

Fixes: out of array access
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SGI_fuzzer-6704753329700864
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SGI_fuzzer-6683986844057600
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SGI_fuzzer-6697387691474944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9f0602a717c3939529bfe49734f3d8029dc36625
---

 libavcodec/sgidec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/sgidec.c b/libavcodec/sgidec.c
index 6ff2ee97f6..92083f23de 100644
--- a/libavcodec/sgidec.c
+++ b/libavcodec/sgidec.c
@@ -159,7 +159,7 @@ static int read_uncompressed_sgi(uint8_t *const out[4], const ptrdiff_t stride[4
     unsigned rowsize = width * bytes_per_channel;
 
     /* Test buffer size. */
-    if (rowsize * (int64_t)height > bytestream2_get_bytes_left(g))
+    if (rowsize * (int64_t)height * nb_components > bytestream2_get_bytes_left(g))
         return AVERROR_INVALIDDATA;
 
     for (unsigned z = 0; z < nb_components; z++) {