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ext4: fix fencepost in s_first_meta_bg validation 

commit 2ba3e6e8af 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: 3a4b77cd47
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Theodore Ts'o 2017-02-15 01:26:39 -05:00 committed by Greg Kroah-Hartman
parent dea2f1e0c5
commit c2eeabe941
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/super.c
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@ -3830,7 +3830,7 @@ 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)",