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Subject: Prevent crash after allocate string of negative size
Author: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/33 [CVE-2016-9623]
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=af592aa5f154f1b0366513ddc2f545032a7b8721
diff --git a/file.c b/file.c
index 32ad98a..ecc1e2f 100644
--- a/file.c
+++ b/file.c
@@ -4999,6 +4999,12 @@ HTMLtagproc1(struct parsed_tag *tag, struct html_feed_environ *h_env)
parsedtag_get_value(tag, ATTR_CELLSPACING, &x);
parsedtag_get_value(tag, ATTR_CELLPADDING, &y);
parsedtag_get_value(tag, ATTR_VSPACE, &z);
+ if (x < 0)
+ x = 0;
+ if (y < 0)
+ y = 0;
+ if (z < 0)
+ z = 0;
#ifdef ID_EXT
parsedtag_get_value(tag, ATTR_ID, &id);
#endif /* ID_EXT */
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