mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/tiff: Ignore tile_count
Fixes: out of array access
Fixes: 52427/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4849108968144896
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 65ce417828
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
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1ff546c033
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6507719760
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@ -99,7 +99,6 @@ typedef struct TiffContext {
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int is_tiled;
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int tile_byte_counts_offset, tile_offsets_offset;
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int tile_width, tile_length;
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int tile_count;
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int is_jpeg;
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@ -994,7 +993,7 @@ static int dng_decode_tiles(AVCodecContext *avctx, AVFrame *frame, AVPacket *avp
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tile_count_y = (s->height + s->tile_length - 1) / s->tile_length;
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/* Iterate over the number of tiles */
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for (tile_idx = 0; tile_idx < s->tile_count; tile_idx++) {
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for (tile_idx = 0; tile_idx < tile_count_x * tile_count_y; tile_idx++) {
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tile_x = tile_idx % tile_count_x;
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tile_y = tile_idx / tile_count_x;
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@ -1427,7 +1426,6 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
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break;
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case TIFF_TILE_OFFSETS:
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s->tile_offsets_offset = off;
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s->tile_count = count;
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s->is_tiled = 1;
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break;
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case TIFF_TILE_BYTE_COUNTS:
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@ -1925,7 +1923,7 @@ again:
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return AVERROR_INVALIDDATA;
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}
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has_tile_bits = s->is_tiled || s->tile_byte_counts_offset || s->tile_offsets_offset || s->tile_width || s->tile_length || s->tile_count;
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has_tile_bits = s->is_tiled || s->tile_byte_counts_offset || s->tile_offsets_offset || s->tile_width || s->tile_length;
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has_strip_bits = s->strippos || s->strips || s->stripoff || s->rps || s->sot || s->sstype || s->stripsize || s->stripsizesoff;
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if (has_tile_bits && has_strip_bits) {
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