linux-kernel - [PATCH] sdio: Read buffer overflow

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Message-ID: <4A7C4501.7070700@gmail.com>
Date:	Fri, 07 Aug 2009 17:15:13 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	drzeus@...eus.cx, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] sdio: Read buffer overflow

If the loop breaks with an index of 0, then we read before the array.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index 963f293..0f8853c 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 (i != 0 && buf[i-1] != '\0') {
 		printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
 		return 0;
 	}
--
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