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| author | Theodore Ts'o <tytso@mit.edu> | 2017-02-15 01:26:39 -0500 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-06-05 21:17:08 +0100 |
| commit | 6cc435bb47841104995c8668de8f5839d0040357 (patch) | |
| tree | cb8408643244814a667201f220aa6698aaf442d6 /fs | |
| parent | b6d98c338b05e18945f9650e15798d41c91be503 (diff) | |
| download | linux-stable-6cc435bb47841104995c8668de8f5839d0040357.tar.gz linux-stable-6cc435bb47841104995c8668de8f5839d0040357.tar.bz2 linux-stable-6cc435bb47841104995c8668de8f5839d0040357.zip | |
ext4: fix fencepost in s_first_meta_bg validation
commit 2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2 upstream.
It is OK for s_first_meta_bg to be equal to the number of block group
descriptor blocks. (It rarely happens, but it shouldn't cause any
problems.)
https://bugzilla.kernel.org/show_bug.cgi?id=194567
Fixes: 3a4b77cd47bb837b8557595ec7425f281f2ca1fe
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index a0f65266fca4..af0267fbecf4 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3916,7 +3916,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); if (EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG)) { - if (le32_to_cpu(es->s_first_meta_bg) >= db_count) { + if (le32_to_cpu(es->s_first_meta_bg) > db_count) { ext4_msg(sb, KERN_WARNING, "first meta block group too large: %u " "(group descriptor block count %u)", |