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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@sw.ru> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Acked-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -215,7 +215,7 @@ static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id)
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struct i2o_message *msg;
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msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
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if (IS_ERR(msg) == I2O_QUEUE_EMPTY)
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if (IS_ERR(msg))
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return PTR_ERR(msg);
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msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
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