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tinfoil patch: make sure pixel_ptr never goes negative

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Originally committed as revision 4513 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2005-08-13 17:46:09 +00:00
parent 6b892a4227
commit a06c7e07d7
1 changed files with 7 additions and 2 deletions
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9
libavcodec/qtrle.c
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@ -58,8 +58,8 @@ typedef struct QtrleContext {
}
#define CHECK_PIXEL_PTR(n) \
if (pixel_ptr + n > pixel_limit) { \
av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \
pixel_ptr + n, pixel_limit); \
return; \
} \
@ -119,6 +119,7 @@ static void qtrle_decode_4bpp(QtrleContext *s)
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (8 * (s->buf[stream_ptr++] - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
@ -209,6 +210,7 @@ static void qtrle_decode_8bpp(QtrleContext *s)
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (4 * (s->buf[stream_ptr++] - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
@ -290,6 +292,7 @@ static void qtrle_decode_16bpp(QtrleContext *s)
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 2;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
@ -367,6 +370,7 @@ static void qtrle_decode_24bpp(QtrleContext *s)
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 3;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
@ -446,6 +450,7 @@ static void qtrle_decode_32bpp(QtrleContext *s)
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 4;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;