[patch 05/54] md: Avoid overflow in raid0 calculation with large components.
-stable review patch. If anyone has any objections, please let us know. - From: NeilBrown <[EMAIL PROTECTED]> If a raid0 has a component device larger than 4TB, and is accessed on a 32bit machines, then as 'chunk' is unsigned lock, chunk << chunksize_bits can overflow (this can be as high as the size of the device in KB). chunk itself will not overflow (without triggering a BUG). So change 'chunk' to be 'sector_t, and get rid of the 'BUG' as it becomes impossible to hit. Cc: "Jeff Zheng" <[EMAIL PROTECTED]> Signed-off-by: Neil Brown <[EMAIL PROTECTED]> Signed-off-by: Chris Wright <[EMAIL PROTECTED]> Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]> --- drivers/md/raid0.c |3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff .prev/drivers/md/raid0.c ./drivers/md/raid0.c --- linux-2.6.21.4.orig/drivers/md/raid0.c +++ linux-2.6.21.4/drivers/md/raid0.c @@ -415,7 +415,7 @@ static int raid0_make_request (request_q raid0_conf_t *conf = mddev_to_conf(mddev); struct strip_zone *zone; mdk_rdev_t *tmp_dev; - unsigned long chunk; + sector_t chunk; sector_t block, rsect; const int rw = bio_data_dir(bio); @@ -470,7 +470,6 @@ static int raid0_make_request (request_q sector_div(x, zone->nb_dev); chunk = x; - BUG_ON(x != (sector_t)chunk); x = block >> chunksize_bits; tmp_dev = zone->dev[sector_div(x, zone->nb_dev)]; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[patch 05/54] md: Avoid overflow in raid0 calculation with large components.
-stable review patch. If anyone has any objections, please let us know. - From: NeilBrown [EMAIL PROTECTED] If a raid0 has a component device larger than 4TB, and is accessed on a 32bit machines, then as 'chunk' is unsigned lock, chunk chunksize_bits can overflow (this can be as high as the size of the device in KB). chunk itself will not overflow (without triggering a BUG). So change 'chunk' to be 'sector_t, and get rid of the 'BUG' as it becomes impossible to hit. Cc: Jeff Zheng [EMAIL PROTECTED] Signed-off-by: Neil Brown [EMAIL PROTECTED] Signed-off-by: Chris Wright [EMAIL PROTECTED] Signed-off-by: Greg Kroah-Hartman [EMAIL PROTECTED] --- drivers/md/raid0.c |3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff .prev/drivers/md/raid0.c ./drivers/md/raid0.c --- linux-2.6.21.4.orig/drivers/md/raid0.c +++ linux-2.6.21.4/drivers/md/raid0.c @@ -415,7 +415,7 @@ static int raid0_make_request (request_q raid0_conf_t *conf = mddev_to_conf(mddev); struct strip_zone *zone; mdk_rdev_t *tmp_dev; - unsigned long chunk; + sector_t chunk; sector_t block, rsect; const int rw = bio_data_dir(bio); @@ -470,7 +470,6 @@ static int raid0_make_request (request_q sector_div(x, zone-nb_dev); chunk = x; - BUG_ON(x != (sector_t)chunk); x = block chunksize_bits; tmp_dev = zone-dev[sector_div(x, zone-nb_dev)]; -- - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
