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avcodec/xpmdec: Move allocations down after more error checks

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Fixes: Timeout
Fixes: 37035/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XPM_fuzzer-5142718576721920

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-03 18:54:08 +02:00
parent 26659fe53e
commit e58692837c
1 changed files with 7 additions and 7 deletions
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14
libavcodec/xpmdec.c
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@ -341,9 +341,6 @@ static int xpm_decode_frame(AVCodecContext *avctx, void *data,
if ((ret = ff_set_dimensions(avctx, width, height)) < 0) if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret; return ret;
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
if (cpp <= 0 || cpp >= 5) { if (cpp <= 0 || cpp >= 5) {
av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of chars per pixel: %d\n", cpp); av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of chars per pixel: %d\n", cpp);
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
@ -360,14 +357,17 @@ static int xpm_decode_frame(AVCodecContext *avctx, void *data,
size *= 4; size *= 4;
av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
if (!x->pixels)
return AVERROR(ENOMEM);
ptr += mod_strcspn(ptr, ",") + 1; ptr += mod_strcspn(ptr, ",") + 1;
if (end - ptr < 1) if (end - ptr < 1)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
if (!x->pixels)
return AVERROR(ENOMEM);
for (i = 0; i < ncolors; i++) { for (i = 0; i < ncolors; i++) {
const uint8_t *index; const uint8_t *index;
int len; int len;