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Merge commit '0b66fb4505e0bb43de3797f63f3290f0188d67cc'

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* commit '0b66fb4505e0bb43de3797f63f3290f0188d67cc':
  flac_picture: prevent a possible out of bound write

This is only partly merged, the condition this checks for
is impossible to be true as it would imply avio_read() to
read more than the size passed to it

See: 731f7eaaade4c0cf91f8008cc30c0342caa64df1
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-25 03:44:17 +02:00
commit af89c14418
1 changed files with 5 additions and 4 deletions
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9
libavformat/flac_picture.c
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@ -33,8 +33,9 @@ int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
uint8_t mimetype[64], *desc = NULL;
AVIOContext *pb = NULL;
AVStream *st;
int type, width, height;
int len, ret = 0;
int width, height, ret = 0;
int len;
unsigned int type;
pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
if (!pb)
@ -42,7 +43,7 @@ int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
/* read the picture type */
type = avio_rb32(pb);
if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
if (s->error_recognition & AV_EF_EXPLODE) {
RETURN_ERROR(AVERROR_INVALIDDATA);
@ -52,7 +53,7 @@ int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
/* picture mimetype */
len = avio_rb32(pb);
if (len <= 0 ||
if (len <= 0 || len >= 64 ||
avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
"picture.\n");