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avcodec/tiff: Check for Tiled and Stripped TIFFs 

TIFF 6 spec: "Do not use both strip-oriented and tile-oriented fields in the same TIFF file."

Fixes: null pointer use, crash
Fixes: crash-762680f9d1b27f9b9085e12887ad44893fb2b020

Found-by: Shiziru <lunasl@protonmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-19 15:15:42 +01:00
parent 49459aca47
commit 70faa9f618
1 changed files with 9 additions and 0 deletions
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9
libavcodec/tiff.c
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@ -1758,6 +1758,7 @@ static int decode_frame(AVCodecContext *avctx,
GetByteContext stripdata;
int retry_for_subifd, retry_for_page;
int is_dng;
int has_tile_bits, has_strip_bits;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
@ -1885,6 +1886,14 @@ again:
return AVERROR_INVALIDDATA;
}
has_tile_bits = s->is_tiled || s->tile_byte_counts_offset || s->tile_offsets_offset || s->tile_width || s->tile_length || s->tile_count;
has_strip_bits = s->strippos || s->strips || s->stripoff || s->rps || s->sot || s->sstype || s->stripsize || s->stripsizesoff;
if (has_tile_bits && has_strip_bits) {
av_log(avctx, AV_LOG_ERROR, "Tiled TIFF is not allowed to strip\n");
return AVERROR_INVALIDDATA;
}
/* now we have the data and may start decoding */
if ((ret = init_image(s, &frame)) < 0)
return ret;