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authorTomohiro Kusumi <kusumi.tomohiro@gmail.com>2015-10-28 21:54:21 +0300
committerMike Snitzer <snitzer@redhat.com>2015-11-01 02:06:06 +0300
commitaad9ae4550755edc020b5c511a8b54f0104b2f47 (patch)
treea94ce06ad5d8fe99c92a09c80ed60c7d8c8882a6 /drivers/md
parentf49e869a61829b8ac6eb069b3824f738cd0146e6 (diff)
downloadlinux-aad9ae4550755edc020b5c511a8b54f0104b2f47.tar.xz
dm switch: simplify conditional in alloc_region_table()
The variable sctx->nr_regions has type unsigned long and the variable nr_regions has type sector_t. Thus the variables may be different when overflow happens. Changed the conditional to "if (nr_regions >= ULONG_MAX)". Also move the assignment of nr_regions after sector_div() and the sanity check which looks more sane. Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com> Reviewed-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-switch.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index b1285753a5d4..871c18fe000d 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -99,11 +99,11 @@ static int alloc_region_table(struct dm_target *ti, unsigned nr_paths)
if (sector_div(nr_regions, sctx->region_size))
nr_regions++;
- sctx->nr_regions = nr_regions;
- if (sctx->nr_regions != nr_regions || sctx->nr_regions >= ULONG_MAX) {
+ if (nr_regions >= ULONG_MAX) {
ti->error = "Region table too large";
return -EINVAL;
}
+ sctx->nr_regions = nr_regions;
nr_slots = nr_regions;
if (sector_div(nr_slots, sctx->region_entries_per_slot))