public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Roel Kluin <roel.kluin@gmail.com>
To: drzeus@drzeus.cx, LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] sdio: Read buffer overflow
Date: Fri, 07 Aug 2009 17:15:13 +0200	[thread overview]
Message-ID: <4A7C4501.7070700@gmail.com> (raw)

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

Signed-off-by: Roel Kluin <roel.kluin@gmail.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;
 	}

             reply	other threads:[~2009-08-07 15:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-07 15:15 Roel Kluin [this message]
2009-08-07 16:45 ` [PATCH] sdio: Read buffer overflow David Vrabel
2009-08-07 17:42   ` Roel Kluin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4A7C4501.7070700@gmail.com \
    --to=roel.kluin@gmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=drzeus@drzeus.cx \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox