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| author | Theodore Ts'o <tytso@mit.edu> | 2018-07-08 19:35:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 07:48:03 +0200 |
| commit | 56ac8b3c5b4936e0533e83995b56f0552264a54a (patch) | |
| tree | c4f61a03e26a02f28aaf59c170f7034327f7dea9 /fs | |
| parent | 1273d1f1c43413ce9f3cc92190c11efd7703685b (diff) | |
| download | linux-stable-56ac8b3c5b4936e0533e83995b56f0552264a54a.tar.gz linux-stable-56ac8b3c5b4936e0533e83995b56f0552264a54a.tar.bz2 linux-stable-56ac8b3c5b4936e0533e83995b56f0552264a54a.zip | |
ext4: fix false negatives *and* false positives in ext4_check_descriptors()
commit 44de022c4382541cebdd6de4465d1f4f465ff1dd upstream.
Ext4_check_descriptors() was getting called before s_gdb_count was
initialized. So for file systems w/o the meta_bg feature, allocation
bitmaps could overlap the block group descriptors and ext4 wouldn't
notice.
For file systems with the meta_bg feature enabled, there was a
fencepost error which would cause the ext4_check_descriptors() to
incorrectly believe that the block allocation bitmap overlaps with the
block group descriptor blocks, and it would reject the mount.
Fix both of these problems.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/super.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 74a6d884ede4..f7ae98c8eca8 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2307,7 +2307,7 @@ static int ext4_check_descriptors(struct super_block *sb, struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); ext4_fsblk_t last_block; - ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0) + 1; + ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0); ext4_fsblk_t block_bitmap; ext4_fsblk_t inode_bitmap; ext4_fsblk_t inode_table; @@ -4050,14 +4050,13 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) goto failed_mount2; } } + sbi->s_gdb_count = db_count; if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) { ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); ret = -EFSCORRUPTED; goto failed_mount2; } - sbi->s_gdb_count = db_count; - timer_setup(&sbi->s_err_report, print_daily_error_info, 0); /* Register extent status tree shrinker */ |