CVE-2016-4912: Null Pointer Dereference

First published: Thu Apr 21 2016(Updated: )

A null pointer dereference vulnerability was found in function _xrealloc() in xlsp_xmalloc.c in OpenSLP. A remote attacker could potentially crash the server when large number of packets are sent. Vulnerable code: void * _xrealloc(const char * file, int line, void * ptr, size_t size) { xallocation_t * x; if (!ptr) return _xmalloc(file, line, size); if (!size) { _xfree(file, line, ptr); return 0; } x = _xmalloc_find(ptr); if (x != 0) { void * newptr = ptr; if (x->size != size) { newptr = _xmalloc(file, line, size); //*** return 0 if failed from _xmalloc memcpy(newptr, ptr, x->size); //*** it'll cased a null pointer reference _xfree(file, line, x); } return newptr; } if (G_xmalloc_fh) fprintf(G_xmalloc_fh, "*** xrealloc called on " "non-xmalloc'd memory ***\n"); return 0; }

Credit: cve@mitre.org

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