From 010904cbed3db3464213fbc602802cc6f53e56e1 Mon Sep 17 00:00:00 2001 From: Vasily Averin Date: Tue, 17 Jul 2007 04:04:25 -0700 Subject: [PATCH] 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 Acked-by: Alan Cox Cc: Markus Lidel Acked-by: Kirill Korotaev Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/message/i2o/i2o_block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c index b17c4b2bc9ef..64a52bd7544a 100644 --- a/drivers/message/i2o/i2o_block.c +++ b/drivers/message/i2o/i2o_block.c @@ -215,7 +215,7 @@ static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) 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);