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avcodec/dnxhddec: treat pix_fmt like width/height 

Fixes out of array accesses
Fixes: asan_heap-oob_22c9a39_16_015.mxf
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-29 00:57:07 +01:00
parent 1a25c336aa
commit f3c0e0bf6f
1 changed files with 10 additions and 3 deletions
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13
libavcodec/dnxhddec.c
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@ -38,6 +38,7 @@ typedef struct DNXHDContext {
BlockDSPContext bdsp;
int64_t cid; ///< compression id
unsigned int width, height;
enum AVPixelFormat pix_fmt;
unsigned int mb_width, mb_height;
uint32_t mb_scan_index[68]; /* max for 1080p */
int cur_field; ///< current interlaced field
@ -141,7 +142,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
ctx->is_444 = 0;
if (buf[0x4] == 0x2) {
ctx->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
ctx->pix_fmt = AV_PIX_FMT_YUV444P10;
ctx->avctx->bits_per_raw_sample = 10;
if (ctx->bit_depth != 10) {
ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
@ -151,7 +152,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
}
ctx->is_444 = 1;
} else if (buf[0x21] & 0x40) {
ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
ctx->pix_fmt = AV_PIX_FMT_YUV422P10;
ctx->avctx->bits_per_raw_sample = 10;
if (ctx->bit_depth != 10) {
ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
@ -160,7 +161,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
ctx->decode_dct_block = dnxhd_decode_dct_block_10;
}
} else {
ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
ctx->pix_fmt = AV_PIX_FMT_YUV422P;
ctx->avctx->bits_per_raw_sample = 8;
if (ctx->bit_depth != 8) {
ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
@ -446,7 +447,13 @@ decode_coding_unit:
avctx->width, avctx->height, ctx->width, ctx->height);
first_field = 1;
}
if (avctx->pix_fmt != AV_PIX_FMT_NONE && avctx->pix_fmt != ctx->pix_fmt) {
av_log(avctx, AV_LOG_WARNING, "pix_fmt changed: %s -> %s\n",
av_get_pix_fmt_name(avctx->pix_fmt), av_get_pix_fmt_name(ctx->pix_fmt));
first_field = 1;
}
avctx->pix_fmt = ctx->pix_fmt;
ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
if (ret < 0)
return ret;