linux-kernel - [112/152] n_gsm: gsm_data_alloc buffer allocation could fail and it is not being checked

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Message-Id: <20110106002307.369687728@clark.site>
Date:	Wed, 05 Jan 2011 16:23:31 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ken Mills <ken.k.mills@...el.com>,
	Alan Cox <alan@...ux.intel.com>
Subject: [112/152] n_gsm: gsm_data_alloc buffer allocation could fail and it is not being checked

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ken Mills <ken.k.mills@...el.com>

commit 093d804611b9a38fe59753b37c29f840518406a9 upstream.

gsm_data_alloc buffer allocation could fail and it is not being checked.

Add check for allocated buffer and return if the buffer allocation
fails.

Signed-off-by: Ken Mills <ken.k.mills@...el.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/char/n_gsm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/char/n_gsm.c
+++ b/drivers/char/n_gsm.c
@@ -968,6 +968,8 @@ static void gsm_control_reply(struct gsm
 {
 	struct gsm_msg *msg;
 	msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype);
+	if (msg == NULL)
+		return;
 	msg->data[0] = (cmd & 0xFE) << 1 | EA;	/* Clear C/R */
 	msg->data[1] = (dlen << 1) | EA;
 	memcpy(msg->data + 2, data, dlen);


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