mtd: memory corruption in block2mtd.c

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: NIngo van Lil <inguin@gmx.de>
Acked-by: NJoern Engel <joern@lazybastard.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: <stable@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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");
 		}
 	}