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authorMikulas Patocka <mpatocka@redhat.com>2009-09-04 23:40:43 +0400
committerAlasdair G Kergon <agk@redhat.com>2009-09-04 23:40:43 +0400
commitae0b7448e91353ea5f821601a055aca6b58042cd (patch)
treea5c5d0532c808fb1eb2c01414edfcd2d0c039a7e /drivers/md/dm-exception-store.c
parent2defcc3fb4661e7351cb2ac48d843efc4c64db13 (diff)
downloadlinux-ae0b7448e91353ea5f821601a055aca6b58042cd.tar.xz
dm snapshot: fix on disk chunk size validation
Fix some problems seen in the chunk size processing when activating a pre-existing snapshot. For a new snapshot, the chunk size can either be supplied by the creator or a default value can be used. For an existing snapshot, the chunk size in the snapshot header on disk should always be used. If someone attempts to load an existing snapshot and has the 'default chunk size' option set, the kernel uses its default value even when it is incorrect for the snapshot being loaded. This patch ensures the correct on-disk value is always used. Secondly, when the code does use the chunk size stored on the disk it is prudent to revalidate it, so the code can exit cleanly if it got corrupted as happened in https://bugzilla.redhat.com/show_bug.cgi?id=461506 . Cc: stable@kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-exception-store.c')
-rw-r--r--drivers/md/dm-exception-store.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 4c01c7535fb5..556acff3952f 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -191,6 +191,11 @@ int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
return -EINVAL;
}
+ if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) {
+ *error = "Chunk size is too high";
+ return -EINVAL;
+ }
+
store->chunk_size = chunk_size_ulong;
store->chunk_mask = chunk_size_ulong - 1;
store->chunk_shift = ffs(chunk_size_ulong) - 1;