[FFmpeg-cvslog] avcodec/rka: check for size 1 filter

[Michael Niedermayer]

ffmpeg | branch: release/6.0 | Michael Niedermayer <michael at niedermayer.cc> | Mon Feb 20 20:00:44 2023 +0100| [b59152b4746e576c9deede398ba0f8e05f5b27c9] | committer: Michael Niedermayer

avcodec/rka: check for size 1 filter

Such filters will not advance and be stuck in the current implementation

Fixes: Infinite loop
Fixes: 56052/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-5236218750435328

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 8874cfa2e174cf1a94123fc2f1a3aa4d307a270f)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b59152b4746e576c9deede398ba0f8e05f5b27c9
---

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

diff --git a/libavcodec/rka.c b/libavcodec/rka.c
index 994c563ffd..7452acf27f 100644
--- a/libavcodec/rka.c
+++ b/libavcodec/rka.c
@@ -691,7 +691,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
     else
         split = size >> 4;
 
-    if (size <= 0)
+    if (size <= 1)
         return 0;
 
     for (int x = 0; x < size;) {