[FFmpeg-devel] [PATCH 1/4] avcodec/jpegxl_parser: ensure input padding is zeroed

[Kacper Michajłow]

Fixes use of uninitialized value, reported by MSAN.

Found by OSS-Fuzz.

Signed-off-by: Kacper Michajłow <kasper93 at gmail.com>
---
 libavcodec/jpegxl_parser.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c
index 8c45e1a1b7..f833f844c4 100644
--- a/libavcodec/jpegxl_parser.c
+++ b/libavcodec/jpegxl_parser.c
@@ -1419,6 +1419,7 @@ static int try_parse(AVCodecParserContext *s, AVCodecContext *avctx, JXLParseCon
         }
         cs_buffer = ctx->cs_buffer;
         cs_buflen = FFMIN(sizeof(ctx->cs_buffer) - AV_INPUT_BUFFER_PADDING_SIZE, ctx->copied);
+        memset(ctx->cs_buffer + cs_buflen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
     } else {
         cs_buffer = buf;
         cs_buflen = buf_size;
-- 
2.43.0