Copied from Fedora.

http://pkgs.fedoraproject.org/cgit/libsndfile.git/plain/libsndfile-1.0.25-cve2014_9496.patch

diff -up libsndfile-1.0.25/src/sd2.c.cve2014_9496 libsndfile-1.0.25/src/sd2.c
--- libsndfile-1.0.25/src/sd2.c.cve2014_9496	2011-01-19 11:10:36.000000000 +0100
+++ libsndfile-1.0.25/src/sd2.c	2015-01-13 17:00:35.920285526 +0100
@@ -395,6 +395,21 @@ read_marker (const unsigned char * data,
 		return 0x666 ;
 } /* read_marker */
 
+static inline int
+read_rsrc_marker (const SD2_RSRC *prsrc, int offset)
+{	const unsigned char * data = prsrc->rsrc_data ;
+
+	if (offset < 0 || offset + 3 >= prsrc->rsrc_len)
+		return 0 ;
+
+	if (CPU_IS_BIG_ENDIAN)
+		return (((uint32_t) data [offset]) << 24) + (data [offset + 1] << 16) + (data [offset + 2] << 8) + data [offset + 3] ;
+	if (CPU_IS_LITTLE_ENDIAN)
+		return data [offset] + (data [offset + 1] << 8) + (data [offset + 2] << 16) + (((uint32_t) data [offset + 3]) << 24) ;
+
+	return 0 ;
+} /* read_rsrc_marker */
+
 static void
 read_str (const unsigned char * data, int offset, char * buffer, int buffer_len)
 {	int k ;
@@ -496,6 +511,11 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 
 	rsrc.type_offset = rsrc.map_offset + 30 ;
 
+	if (rsrc.map_offset + 28 > rsrc.rsrc_len)
+	{       psf_log_printf (psf, "Bad map offset.\n") ;
+		goto parse_rsrc_fork_cleanup ;
+		} ;
+
 	rsrc.type_count = read_short (rsrc.rsrc_data, rsrc.map_offset + 28) + 1 ;
 	if (rsrc.type_count < 1)
 	{	psf_log_printf (psf, "Bad type count.\n") ;
@@ -512,7 +532,12 @@ sd2_parse_rsrc_fork (SF_PRIVATE *psf)
 
 	rsrc.str_index = -1 ;
 	for (k = 0 ; k < rsrc.type_count ; k ++)
-	{	marker = read_marker (rsrc.rsrc_data, rsrc.type_offset + k * 8) ;
+	{	if (rsrc.type_offset + k * 8 > rsrc.rsrc_len)
+		{	psf_log_printf (psf, "Bad rsrc marker.\n") ;
+			goto parse_rsrc_fork_cleanup ;
+			} ;
+
+		marker = read_rsrc_marker (&rsrc, rsrc.type_offset + k * 8) ;
 
 		if (marker == STR_MARKER)
 		{	rsrc.str_index = k ;
