From daffde0544aa7db7964d7a9dc8e36cee831709f7 Mon Sep 17 00:00:00 2001 From: Leo Izen Date: Fri, 12 Jul 2024 15:03:17 -0400 Subject: [PATCH] avcodec/png: more informative error message for invalid sBIT size If the sBIT chunk size is invalid, we should print a more informative error message rather than return an error and print nothing. Signed-off-by: Leo Izen --- libavcodec/pngdec.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 8a881963b5..ac39b3277b 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -1084,8 +1084,11 @@ static int decode_sbit_chunk(AVCodecContext *avctx, PNGDecContext *s, channels = s->color_type & PNG_COLOR_MASK_PALETTE ? 3 : ff_png_get_nb_channels(s->color_type); - if (bytestream2_get_bytes_left(gb) != channels) + if (bytestream2_get_bytes_left(gb) != channels) { + av_log(avctx, AV_LOG_ERROR, "Invalid sBIT size: %d, expected: %d\n", + bytestream2_get_bytes_left(gb), channels); return AVERROR_INVALIDDATA; + } for (int i = 0; i < channels; i++) { int b = bytestream2_get_byteu(gb);