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| author | Daniel Gryniewicz <dang@linuxbox.com> | 2014-09-16 10:41:13 -0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2014-09-19 13:23:33 +0100 |
| commit | f81426a84bef870d26e5e752772d8ca203cd4aed (patch) | |
| tree | 83463b74b0232ec854ed7dc79341c2d3ba836265 /drivers/scsi/scsi_lib.c | |
| parent | e8be1cf58d5b4ddbf8089700df8458f432ed5934 (diff) | |
| download | linux-stable-f81426a84bef870d26e5e752772d8ca203cd4aed.tar.gz linux-stable-f81426a84bef870d26e5e752772d8ca203cd4aed.tar.bz2 linux-stable-f81426a84bef870d26e5e752772d8ca203cd4aed.zip | |
[SCSI] fix for bidi use after free
When ending a bi-directionional SCSI request, blk_finish_request()
cleans up and frees the request, but scsi_release_bidi_buffers() tries
to indirect through the request to find it's data buffers. This causes
a panic due to a null pointer dereference.
Move the call to scsi_release_bidi_buffers() before the call to
blk_finish_request().
Signed-off-by: Daniel Gryniewicz <dang@linuxbox.com>
Reviewed-by: Webb Scales <webbnh@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index d837dc180522..aaea4b98af16 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -733,12 +733,13 @@ static bool scsi_end_request(struct request *req, int error, } else { unsigned long flags; + if (bidi_bytes) + scsi_release_bidi_buffers(cmd); + spin_lock_irqsave(q->queue_lock, flags); blk_finish_request(req, error); spin_unlock_irqrestore(q->queue_lock, flags); - if (bidi_bytes) - scsi_release_bidi_buffers(cmd); scsi_release_buffers(cmd); scsi_next_command(cmd); } |