[FFmpeg-cvslog] nsvdec: Be more careful with av_malloc().

Alex Converse git at videolan.org
Mon Apr 2 01:45:24 CEST 2012


ffmpeg | branch: release/0.8 | Alex Converse <alex.converse at gmail.com> | Thu Jan 26 17:21:46 2012 -0800| [be524c186b50337db64d34a5726dfe3e8ea94f09] | committer: Reinhard Tartler

nsvdec: Be more careful with av_malloc().

Check results for av_malloc() and fix an overflow in one call.

Related to CVE-2011-3940.

Based in part on work from Michael Niedermayer.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
(cherry picked from commit 8fd8a48263ff1437f9d02d7e78dc63efb9b5ed3a)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=be524c186b50337db64d34a5726dfe3e8ea94f09
---

 libavformat/nsvdec.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index c37300f..7041523 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -307,7 +307,9 @@ static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
         char *token, *value;
         char quote;
 
-        p = strings = av_mallocz(strings_size + 1);
+        p = strings = av_mallocz((size_t)strings_size + 1);
+        if (!p)
+            return AVERROR(ENOMEM);
         endp = strings + strings_size;
         avio_read(pb, strings, strings_size);
         while (p < endp) {
@@ -342,6 +344,8 @@ static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
         if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
             return -1;
         nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
+        if (!nsv->nsvs_file_offset)
+            return AVERROR(ENOMEM);
 
         for(i=0;i<table_entries_used;i++)
             nsv->nsvs_file_offset[i] = avio_rl32(pb) + size;
@@ -349,6 +353,8 @@ static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
         if(table_entries > table_entries_used &&
            avio_rl32(pb) == MKTAG('T','O','C','2')) {
             nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
+            if (!nsv->nsvs_timestamps)
+                return AVERROR(ENOMEM);
             for(i=0;i<table_entries_used;i++) {
                 nsv->nsvs_timestamps[i] = avio_rl32(pb);
             }



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