linux-kernel - [PATCH] Staging: rtl8192e: Fix segfault upon alloc failure

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Message-Id: <1415203879-17261-1-git-send-email-danieru.dressler@gmail.com>
Date:	Thu,  6 Nov 2014 01:11:17 +0900
From:	Daniel Dressler <danieru.dressler@...il.com>
To:	danieru.dressler@...il.com
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matthew Casey <mdcasey@...bloom.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] Staging: rtl8192e: Fix segfault upon alloc failure

Kernel space allocations can fail. This patch
fixes a crash condition upon allocation failure.

Should this condition occur init_firmware() will
goto its error handler and declare download failure.

Of interesting note is that prior to this patch
fw_download_code() could never fail yet our caller
checked the return value.

Reported-by: RUC_Soft_Sec <rucsoftsec@...il.com>
Signed-off-by: Daniel Dressler <danieru.dressler@...il.com>
---
 drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
index 2e28744..e4257fe 100644
--- a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
+++ b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
@@ -61,6 +61,9 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
 		}
 
 		skb  = dev_alloc_skb(frag_length + 4);
+		if (!skb)
+			return false;
+
 		memcpy((unsigned char *)(skb->cb), &dev, sizeof(dev));
 		tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
 		tcb_desc->queue_index = TXCMD_QUEUE;
-- 
2.1.0

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