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matroskadec: Check that .lang was allocated and set before reading it

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-03 12:10:50 +03:00
parent f7c5883126
commit 5bcd3ae5b1
1 changed files with 2 additions and 1 deletions
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3
libavformat/matroskadec.c
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@ -1189,7 +1189,8 @@ static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
int i;
for (i=0; i < list->nb_elem; i++) {
const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
const char *lang = tags[i].lang && strcmp(tags[i].lang, "und") ?
tags[i].lang : NULL;
if (!tags[i].name) {
av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");