[FFmpeg-cvslog] avcodec/iff: Use signed count

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jul  5 02:21:48 2024 +0200| [2115efc337d2c0a7f40d3e9949fed7bbbe343512] | committer: Michael Niedermayer

avcodec/iff: Use signed count

This is more a style fix than a bugfix (CID1604392 Overflowed constant)

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cfe66dfebb8a1e1394bcf834b6cc785f280ccecf)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2115efc337d2c0a7f40d3e9949fed7bbbe343512
---

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

diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index 76d3696bb3..629c58dfbd 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -583,7 +583,7 @@ static int decode_byterun2(uint8_t *dst, int height, int line_size,
                            GetByteContext *gb)
 {
     GetByteContext cmds;
-    unsigned count;
+    int count;
     int i, y_pos = 0, x_pos = 0;
 
     if (bytestream2_get_be32(gb) != MKBETAG('V', 'D', 'A', 'T'))
@@ -591,7 +591,7 @@ static int decode_byterun2(uint8_t *dst, int height, int line_size,
 
     bytestream2_skip(gb, 4);
     count = bytestream2_get_be16(gb) - 2;
-    if (bytestream2_get_bytes_left(gb) < count)
+    if (count < 0 || bytestream2_get_bytes_left(gb) < count)
         return 0;
 
     bytestream2_init(&cmds, gb->buffer, count);