| From 2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2 Mon Sep 17 00:00:00 2001 |
| From: Theodore Ts'o <tytso@mit.edu> |
| Date: Wed, 15 Feb 2017 01:26:39 -0500 |
| Subject: [PATCH] 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> |
| Cc: stable@vger.kernel.org |
| |
| diff --git a/fs/ext4/super.c b/fs/ext4/super.c |
| index dde14a7ac6d7..a673558fe5f8 100644 |
| --- a/fs/ext4/super.c |
| +++ b/fs/ext4/super.c |
| @@ -3860,7 +3860,7 @@ 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_feature_meta_bg(sb)) { |
| - 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)", |
| -- |
| 2.12.0 |
| |
