mtd: memory corruption in block2mtd.c

upstream commit: 2875fb65f8e40401c4b781ebc5002df10485f635

The block2mtd driver (drivers/mtd/devices/block2mtd.c) will kfree an on-stack
pointer when handling an invalid argument line (e.g.
block2mtd=/dev/loop0,xxx).

The kfree was added some time ago when "name" was dynamically allocated.

Signed-off-by: Ingo van Lil <inguin@gmx.de>
Acked-by: Joern Engel <joern@lazybastard.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index be4b9948c762e33b577cbd192dd836ff50c75e46..84038caf324d5ae30fa018e2166522eba8618ef9 100644 (file)
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -408,7 +408,6 @@ static int block2mtd_setup2(const char *val)
        if (token[1]) {
                ret = parse_num(&erase_size, token[1]);
                if (ret) {
-                       kfree(name);
                        parse_err("illegal erase size");
                }
        }