commit 1b57efe37fd4ef80058b05415a2a0e6b8eaab565
Author: Tomas Korbar <tkorbar@redhat.com>
Date:   Mon Mar 21 12:51:17 2022 +0100

    Prevent integer overflow in storeRawNames

diff --git a/lib/xmlparse.c b/lib/xmlparse.c
index 4bfb860..989ab8c 100644
--- a/lib/xmlparse.c
+++ b/lib/xmlparse.c
@@ -2099,6 +2099,7 @@ storeRawNames(XML_Parser parser)
   while (tag) {
     int bufSize;
     int nameLen = sizeof(XML_Char) * (tag->name.strLen + 1);
+    size_t rawNameLen;
     char *rawNameBuf = tag->buf + nameLen;
     /* Stop if already stored.  Since tagStack is a stack, we can stop
        at the first entry that has already been copied; everything
@@ -2110,7 +2111,11 @@ storeRawNames(XML_Parser parser)
     /* For re-use purposes we need to ensure that the
        size of tag->buf is a multiple of sizeof(XML_Char).
     */
-    bufSize = nameLen + ROUND_UP(tag->rawNameLength, sizeof(XML_Char));
+    rawNameLen = ROUND_UP(tag->rawNameLength, sizeof(XML_Char));
+    /* Detect and prevent integer overflow. */
+    if (rawNameLen > (size_t)INT_MAX - nameLen)
+      return XML_FALSE;
+    bufSize = nameLen + (int)rawNameLen;
     if (bufSize > tag->bufEnd - tag->buf) {
       char *temp = (char *)REALLOC(tag->buf, bufSize);
       if (temp == NULL)