[patch 17/32] kbuild: fixdep segfault on pathological string-o-death

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Andy Green <andy@xxxxxxxxxxx>

build scripts: fixdep blows segfault on string CONFIG_MODULE seen

The string "CONFIG_MODULE" appearing anywhere in a source file causes
fixdep to segfault.  This string appeared in the wild in the current
mISDN sources (I think they meant CONFIG_MODULES).  But it shouldn't
segfault (esp as CONFIG_MODULE appeared in a quoted string).

Signed-off-by: Andy Green <andy@xxxxxxxxxxx>
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
Fixes https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241915

 scripts/basic/fixdep.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-2.6.20.13.orig/scripts/basic/fixdep.c
+++ linux-2.6.20.13/scripts/basic/fixdep.c
@@ -249,6 +249,8 @@ void parse_config_file(char *map, size_t
 	found:
 		if (!memcmp(q - 7, "_MODULE", 7))
 			q -= 7;
+		if( (q-p-7) < 0 )
+			continue;
 		use_config(p+7, q-p-7);
 	}
 }

-- 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/