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authorMilan Broz <mbroz@redhat.com>2009-01-06 06:05:01 +0300
committerAlasdair G Kergon <agk@redhat.com>2009-01-06 06:05:01 +0300
commit2045e88edb4e0c9ce62d317f77dc59d27d9c530e (patch)
tree324eeea271b889263d0141fe0c82d4b0e43d0079 /drivers/md/dm-log.c
parent6f3af01cb0eda0ec50fe1e4cbdf028269dc396fe (diff)
downloadlinux-2045e88edb4e0c9ce62d317f77dc59d27d9c530e.tar.xz
dm log: move region_size validation
Move log size validation from mirror target to log constructor. Removed PAGE_SIZE restriction we no longer think necessary. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-log.c')
-rw-r--r--drivers/md/dm-log.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 691cb9c22b56..40ed70df6736 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -360,6 +360,17 @@ static int read_header(struct log_c *log)
return 0;
}
+static int _check_region_size(struct dm_target *ti, uint32_t region_size)
+{
+ if (region_size < 2 || region_size > ti->len)
+ return 0;
+
+ if (!is_power_of_2(region_size))
+ return 0;
+
+ return 1;
+}
+
/*----------------------------------------------------------------
* core log constructor/destructor
*
@@ -395,8 +406,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
}
}
- if (sscanf(argv[0], "%u", &region_size) != 1) {
- DMWARN("invalid region size string");
+ if (sscanf(argv[0], "%u", &region_size) != 1 ||
+ !_check_region_size(ti, region_size)) {
+ DMWARN("invalid region size %s", argv[0]);
return -EINVAL;
}