This is a note to let you know that I've just added the patch titled
staging: zram: fix data corruption issue
to the 2.6.37-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-zram-fix-data-corruption-issue.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 5414e557fca545614ceedc3d3496f747457e2e3b Mon Sep 17 00:00:00 2001
From: Nitin Gupta <[email protected]>
Date: Sat, 5 Feb 2011 20:34:20 -0500
Subject: staging: zram: fix data corruption issue
From: Nitin Gupta <[email protected]>
commit 5414e557fca545614ceedc3d3496f747457e2e3b upstream.
In zram_read() and zram_write() we were not incrementing the
index number and thus were reading/writing values from/to
incorrect sectors on zram disk, resulting in data corruption.
Signed-off-by: Nitin Gupta <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/staging/zram/zram_drv.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -227,6 +227,7 @@ static int zram_read(struct zram *zram,
if (zram_test_flag(zram, index, ZRAM_ZERO)) {
handle_zero_page(page);
+ index++;
continue;
}
@@ -235,12 +236,14 @@ static int zram_read(struct zram *zram,
pr_debug("Read before write: sector=%lu, size=%u",
(ulong)(bio->bi_sector), bio->bi_size);
/* Do nothing */
+ index++;
continue;
}
/* Page is stored uncompressed since it's incompressible */
if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {
handle_uncompressed_page(zram, page, index);
+ index++;
continue;
}
@@ -320,6 +323,7 @@ static int zram_write(struct zram *zram,
mutex_unlock(&zram->lock);
zram_stat_inc(&zram->stats.pages_zero);
zram_set_flag(zram, index, ZRAM_ZERO);
+ index++;
continue;
}
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.37/staging-zram-fix-data-corruption-issue.patch
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