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indeo3: fix out of cell write.

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Fixes CVE-2012-2776.

CC:libav-stable@libav.org

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
This commit is contained in:
Anton Khirnov
2012-09-29 10:39:49 +02:00
parent 065b3a1cfa
commit e4d4044339
1 changed files with 3 additions and 0 deletions
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3
libavcodec/indeo3.c
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@@ -421,6 +421,9 @@ static int decode_cell_data(Cell *cell, uint8_t *block, uint8_t *ref_block,
blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2); blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2);
line_offset = v_zoom ? row_offset : 0; line_offset = v_zoom ? row_offset : 0;
if (cell->height & v_zoom || cell->width & h_zoom)
return IV3_BAD_DATA;
for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) { for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) {
for (x = 0; x < cell->width; x += 1 + h_zoom) { for (x = 0; x < cell->width; x += 1 + h_zoom) {
ref = ref_block; ref = ref_block;