From: Roel Kluin <roel.kluin@gmail.com>
Date: Tue, 22 Sep 2009 23:45:09 +0000 (-0700)
Subject: sdio: fix read buffer overflow
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4245c0256da0784b1f96d01ff263a71a4ca3894e;p=linux-beck.git

sdio: fix read buffer overflow

Avoid buffer underrun when parsing an invalid CISTPL_VERS_1.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: David Vrabel <david.vrabel@csr.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index 963f2937c5e3..6636354b48ce 100644
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c
@@ -40,7 +40,7 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
 			nr_strings++;
 	}
 
-	if (buf[i-1] != '\0') {
+	if (nr_strings < 4) {
 		printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
 		return 0;
 	}