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jpeglsenc: Check memory allocations 

Convert exisiting free functions to av_freep() to avoid accidental
double frees, and always intialize all buffers to NULL.
This commit is contained in:
Vittorio Giovara 2015-04-24 16:59:32 +01:00
parent f5ba67ee13
commit 3919a45726
1 changed files with 23 additions and 6 deletions
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29
libavcodec/jpeglsenc.c
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@ -253,7 +253,10 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
const int near = avctx->prediction_method;
PutBitContext pb, pb2;
GetBitContext gb;
uint8_t *buf2, *zero, *cur, *last;
uint8_t *buf2 = NULL;
uint8_t *zero = NULL;
uint8_t *cur = NULL;
uint8_t *last = NULL;
JLSState *state;
int i, size, ret;
int comps;
@ -271,6 +274,8 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
}
buf2 = av_malloc(pkt->size);
if (!buf2)
goto memfail;
init_put_bits(&pb, pkt->data, pkt->size);
init_put_bits(&pb2, buf2, pkt->size);
@ -301,6 +306,9 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
put_bits(&pb, 8, 0); // point transform: none
state = av_mallocz(sizeof(JLSState));
if (!state)
goto memfail;
/* initialize JPEG-LS state from JPEG parameters */
state->near = near;
state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
@ -309,8 +317,10 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
ls_store_lse(state, &pb);
zero = av_mallocz(p->linesize[0]);
last = zero;
zero = last = av_mallocz(p->linesize[0]);
if (!zero)
goto memfail;
cur = p->data[0];
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
int t = 0;
@ -360,8 +370,8 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
}
}
av_free(zero);
av_free(state);
av_freep(&zero);
av_freep(&state);
/* the specification says that after doing 0xff escaping unused bits in
* the last byte must be set to 0, so just append 7 "optional" zero-bits
@ -382,7 +392,7 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
}
}
avpriv_align_put_bits(&pb);
av_free(buf2);
av_freep(&buf2);
/* End of image */
put_marker(&pb, EOI);
@ -394,6 +404,13 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
memfail:
av_free_packet(pkt);
av_freep(&buf2);
av_freep(&state);
av_freep(&zero);
return AVERROR(ENOMEM);
}
static av_cold int encode_close(AVCodecContext *avctx)