linux-kernel - [19/49] ore: Fix crash in case of an IO error.

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Date:	Tue, 10 Jan 2012 13:55:22 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Boaz Harrosh <bharrosh@...asas.com>
Subject: [19/49] ore: Fix crash in case of an IO error.

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boaz Harrosh <bharrosh@...asas.com>

commit ffefb8eaa367e8a5c14f779233d9da1fbc23d164 upstream.

The users of ore_check_io() expect the reported device
(In case of error) to be indexed relative to the passed-in
ore_components table, and not the logical dev index.

This causes a crash inside objlayoutdriver in case of
an IO error.

Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/exofs/ore.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -445,10 +445,10 @@ int ore_check_io(struct ore_io_state *io
 			u64 residual = ios->reading ?
 					or->in.residual : or->out.residual;
 			u64 offset = (ios->offset + ios->length) - residual;
-			struct ore_dev *od = ios->oc->ods[
-					per_dev->dev - ios->oc->first_dev];
+			unsigned dev = per_dev->dev - ios->oc->first_dev;
+			struct ore_dev *od = ios->oc->ods[dev];
 
-			on_dev_error(ios, od, per_dev->dev, osi.osd_err_pri,
+			on_dev_error(ios, od, dev, osi.osd_err_pri,
 				     offset, residual);
 		}
 		if (osi.osd_err_pri >= acumulated_osd_err) {


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