linux-kernel - [patch i2o 2/6] wrong memory access in i2o_block_device

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Date:	Tue, 15 May 2007 16:43:17 +0400
From:	Vasily Averin <vvs@...ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Markus Lidel <Markus.Lidel@...dowconnect.com>
Subject: [patch i2o 2/6] wrong memory access in i2o_block_device_lock()

This patch fixes access to memory that has not been allocated:
i2o_msg_get_wait() can returns errors different from I2O_QUEUE_EMPTY. But the
result is checked only against this code. If it is not I2O_QUEUE_EMPTY then we
dereference the error code as the pointer later.

Signed-off-by: Vasily Averin <vvs@...ru>

--- lk2.6/drivers/message/i2o/i2o_block.c
+++ lk2.6/drivers/message/i2o/i2o_block.c
@@ -215,7 +215,7 @@ static int i2o_block_device_lock(struct
 	struct i2o_message *msg;

 	msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
-	if (IS_ERR(msg) == I2O_QUEUE_EMPTY)
+	if (IS_ERR(msg))
 		return PTR_ERR(msg);

 	msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);

-
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