* Allocating 16 bytes more for the MEMALIGN_HACK is enough. There's no

need for 1 more extra byte.

* Checking whether the to be allocated size is larger than INT_MAX,
doesn't assure that size+16 bytes for the MEMALIGN_HACK isn't larger
than INT_MAX.

* malloc might return NULL. Checking for it before using that pointer
seems like a good idea.
Patch by Herve W. H PPP O PPP W PPP aka PPP V+ffmpeg AH gmail PPP com
Original thread:
Date: Jun 29, 2006 1:21 PM
Subject: [Ffmpeg-devel] [PATCH] minor improvements to libavcodec/mem.c

Originally committed as revision 5559 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mem.c

@@ -50,11 +50,13 @@ void *av_malloc(unsigned int size)
 #endif
 
     /* let's disallow possible ambiguous cases */
-    if(size > INT_MAX)
+    if(size > (INT_MAX-16) )
         return NULL;
 
 #ifdef MEMALIGN_HACK
-    ptr = malloc(size+16+1);
+    ptr = malloc(size+16);
+    if(!ptr)
+        return ptr;
     diff= ((-(long)ptr - 1)&15) + 1;
     ptr += diff;
     ((char*)ptr)[-1]= diff;
@@ -104,7 +106,7 @@ void *av_realloc(void *ptr, unsigned int size)
 #endif
 
     /* let's disallow possible ambiguous cases */
-    if(size > INT_MAX)
+    if(size > (INT_MAX-16) )
         return NULL;
 
 #ifdef MEMALIGN_HACK