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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-05-02 10:58:55 -0700 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-05-04 16:06:47 -0700 |
| commit | d2205d6543881f2e6fa18c8a354bbcf91a1235f7 (patch) | |
| tree | 1d43bbadb8b06b287d1edd946801aaaccb2b7144 | |
| parent | 273e6af47b38391f2bcc157cca0423fe7fcbf55c (diff) | |
| download | ffmpeg-d2205d6543881f2e6fa18c8a354bbcf91a1235f7.tar.gz | |
png: check bit depth for PAL8/Y400A pixel formats.
Wrong bit depth can lead to invalid rowsize values, which crashes the
decoder further down.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
| -rw-r--r-- | libavcodec/pngdec.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 087abaed89..871f2b2ba3 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -479,9 +479,11 @@ static int decode_frame(AVCodecContext *avctx, } else if (s->bit_depth == 1 && s->color_type == PNG_COLOR_TYPE_GRAY) { avctx->pix_fmt = PIX_FMT_MONOBLACK; - } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) { + } else if (s->bit_depth == 8 && + s->color_type == PNG_COLOR_TYPE_PALETTE) { avctx->pix_fmt = PIX_FMT_PAL8; - } else if (s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { + } else if (s->bit_depth == 8 && + s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { avctx->pix_fmt = PIX_FMT_Y400A; } else { goto fail; |