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authorNitin Gupta <ngupta@vflare.org>2011-02-05 20:34:20 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-09 11:39:51 -0800
commit5414e557fca545614ceedc3d3496f747457e2e3b (patch)
tree2b9ce2de75be0328792043f65e7e25aace24417b /drivers
parent0742cecbd431fd057b45fd8c0d60f0907e00e17f (diff)
staging: zram: fix data corruption issue
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 <ngupta@vflare.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/zram/zram_drv.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 5415712f01f..4bd8cbdaee7 100644
--- 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, struct bio *bio)
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, struct bio *bio)
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, struct bio *bio)
mutex_unlock(&zram->lock);
zram_stat_inc(&zram->stats.pages_zero);
zram_set_flag(zram, index, ZRAM_ZERO);
+ index++;
continue;
}