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Code Issues Releases Activity

avcodec/c93: Fix segfault when using negative linesizes

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c93.c used an int for the stride and an unsigned for the current
linenumber. This does not work when using negative linesizes.
So use ptrdiff_t for stride and int for linenumber.

This fixes the cyberia-c93 FATE test when using negative linesizes.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-09-30 18:12:46 +02:00
parent ce4713ea73
commit fced3a17db
1 changed files with 8 additions and 7 deletions
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15
libavcodec/c93.c
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@@ -130,7 +130,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
AVFrame * const oldpic = c93->pictures[c93->currentpic^1];
GetByteContext gb;
uint8_t *out;
int stride, ret, i, x, y, b, bt = 0;
int ret, i, x, y, b, bt = 0;
ptrdiff_t stride;
if ((ret = ff_set_dimensions(avctx, WIDTH, HEIGHT)) < 0)
return ret;
@@ -156,7 +157,6 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
out = newpic->data[0] + y * stride;
for (x = 0; x < WIDTH; x += 8) {
uint8_t *copy_from = oldpic->data[0];
unsigned int offset, j;
uint8_t cols[4], grps[4];
C93BlockType block_type;
@@ -165,16 +165,17 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
block_type= bt & 0x0F;
switch (block_type) {
case C93_8X8_FROM_PREV:
offset = bytestream2_get_le16(&gb);
case C93_8X8_FROM_PREV: {
int offset = bytestream2_get_le16(&gb);
if ((ret = copy_block(avctx, out, copy_from, offset, 8, stride)) < 0)
return ret;
break;
}
case C93_4X4_FROM_CURR:
copy_from = newpic->data[0];
case C93_4X4_FROM_PREV:
for (j = 0; j < 8; j += 4) {
for (int j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
int offset = bytestream2_get_le16(&gb);
int from_x = offset % WIDTH;
@@ -203,7 +204,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
case C93_4X4_2COLOR:
case C93_4X4_4COLOR:
case C93_4X4_4COLOR_GRP:
for (j = 0; j < 8; j += 4) {
for (int j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
if (block_type == C93_4X4_2COLOR) {
bytestream2_get_buffer(&gb, cols, 2);
@@ -226,7 +227,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
break;
case C93_8X8_INTRA:
for (j = 0; j < 8; j++)
for (int j = 0; j < 8; j++)
bytestream2_get_buffer(&gb, out + j*stride, 8);
break;