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From b1a4e51efbfb1ae3a37a14be73d438aaab6b5c9e Mon Sep 17 00:00:00 2001
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From: Pranjal Jumde <pjumde@apple.com>
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Date: Tue, 8 Mar 2016 17:29:00 -0800
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Subject: [PATCH] Bug 763071: heap-buffer-overflow in xmlStrncat
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<https://bugzilla.gnome.org/show_bug.cgi?id=763071>
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To: libvir-list@redhat.com
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* xmlstring.c:
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(xmlStrncat): Return NULL if xmlStrlen returns a negative length.
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(xmlStrncatNew): Ditto.
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Signed-off-by: Daniel Veillard <veillard@redhat.com>
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---
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xmlstring.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/xmlstring.c b/xmlstring.c
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index a37220d..d465c23 100644
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--- a/xmlstring.c
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+++ b/xmlstring.c
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@@ -457,6 +457,8 @@ xmlStrncat(xmlChar *cur, const xmlChar *add, int len) {
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return(xmlStrndup(add, len));
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size = xmlStrlen(cur);
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+ if (size < 0)
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+ return(NULL);
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ret = (xmlChar *) xmlRealloc(cur, (size + len + 1) * sizeof(xmlChar));
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if (ret == NULL) {
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xmlErrMemory(NULL, NULL);
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@@ -484,14 +486,19 @@ xmlStrncatNew(const xmlChar *str1, const xmlChar *str2, int len) {
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int size;
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xmlChar *ret;
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- if (len < 0)
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+ if (len < 0) {
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len = xmlStrlen(str2);
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+ if (len < 0)
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+ return(NULL);
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+ }
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if ((str2 == NULL) || (len == 0))
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return(xmlStrdup(str1));
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if (str1 == NULL)
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return(xmlStrndup(str2, len));
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size = xmlStrlen(str1);
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+ if (size < 0)
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+ return(NULL);
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ret = (xmlChar *) xmlMalloc((size + len + 1) * sizeof(xmlChar));
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if (ret == NULL) {
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xmlErrMemory(NULL, NULL);
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--
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2.5.5
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