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ext4: avoid potential buffer_head leak in __ext4_new_inode()

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[ Upstream commit 227d31b9214d1b9513383cf6c7180628d4b3b61f ]

If a group is marked EXT4_GROUP_INFO_IBITMAP_CORRUPT after it's inode
bitmap buffer_head was successfully verified, then __ext4_new_inode()
will get a valid inode_bitmap_bh of a corrupted group from
ext4_read_inode_bitmap() in which case inode_bitmap_bh misses a release.
Hnadle "IS_ERR(inode_bitmap_bh)" and group corruption separately like
how ext4_free_inode() does to avoid buffer_head leak.

Fixes: 9008a58e5dce ("ext4: make the bitmap read routines return real error codes")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://patch.msgid.link/20240820132234.2759926-3-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kemeng Shi 2024-08-20 21:22:29 +08:00 • committed by Ksawlii
parent 4e2ca3b317
commit 919de34d5e
1 changed files with 4 additions and 3 deletions
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7
fs/ext4/ialloc.c
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@ -1056,12 +1056,13 @@ got_group:
brelse(inode_bitmap_bh);
inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
/* Skip groups with suspicious inode tables */
if (((!(sbi->s_mount_state & EXT4_FC_REPLAY))
&& EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) ||
IS_ERR(inode_bitmap_bh)) {
if (IS_ERR(inode_bitmap_bh)) {
inode_bitmap_bh = NULL;
goto next_group;
}
if (!(sbi->s_mount_state & EXT4_FC_REPLAY) &&
EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
goto next_group;
repeat_in_this_group:
ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);