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Fixes CVE-2014-3587. Copied from upstream commit
0641e56be1af003aa02c7c6b0184466540637233.
--- file-5.19/src/cdf.c.orig 2014-06-09 09:04:37.000000000 -0400
+++ file-5.19/src/cdf.c 2014-08-26 11:55:23.887118898 -0400
@@ -824,6 +824,10 @@
q = (const uint8_t *)(const void *)
((const char *)(const void *)p + ofs
- 2 * sizeof(uint32_t));
+ if (q < p) {
+ DPRINTF(("Wrapped around %p < %p\n", q, p));
+ goto out;
+ }
if (q > e) {
DPRINTF(("Ran of the end %p > %p\n", q, e));
goto out;
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