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author | Baokun Li <libaokun1@huawei.com> | 2022-08-17 16:27:01 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-14 12:16:37 +0300 |
commit | d6d18d6e2d068e6d1e62f7d8cd1a1a2139c7b3df (patch) | |
tree | d4cc8957eefe5f3b25480a802aac419dcf5627e1 /fs | |
parent | bdc698ce91f232fd5eb11d2373e9f82f687314b8 (diff) | |
download | linux-d6d18d6e2d068e6d1e62f7d8cd1a1a2139c7b3df.tar.xz |
ext4: add inode table check in __ext4_get_inode_loc to aovid possible infinite loop
commit eee22187b53611e173161e38f61de1c7ecbeb876 upstream.
In do_writepages, if the value returned by ext4_writepages is "-ENOMEM"
and "wbc->sync_mode == WB_SYNC_ALL", retry until the condition is not met.
In __ext4_get_inode_loc, if the bh returned by sb_getblk is NULL,
the function returns -ENOMEM.
In __getblk_slow, if the return value of grow_buffers is less than 0,
the function returns NULL.
When the three processes are connected in series like the following stack,
an infinite loop may occur:
do_writepages <--- keep retrying
ext4_writepages
mpage_map_and_submit_extent
mpage_map_one_extent
ext4_map_blocks
ext4_ext_map_blocks
ext4_ext_handle_unwritten_extents
ext4_ext_convert_to_initialized
ext4_split_extent
ext4_split_extent_at
__ext4_ext_dirty
__ext4_mark_inode_dirty
ext4_reserve_inode_write
ext4_get_inode_loc
__ext4_get_inode_loc <--- return -ENOMEM
sb_getblk
__getblk_gfp
__getblk_slow <--- return NULL
grow_buffers
grow_dev_page <--- return -ENXIO
ret = (block < end_block) ? 1 : -ENXIO;
In this issue, bg_inode_table_hi is overwritten as an incorrect value.
As a result, `block < end_block` cannot be met in grow_dev_page.
Therefore, __ext4_get_inode_loc always returns '-ENOMEM' and do_writepages
keeps retrying. As a result, the writeback process is in the D state due
to an infinite loop.
Add a check on inode table block in the __ext4_get_inode_loc function by
referring to ext4_read_inode_bitmap to avoid this infinite loop.
Cc: stable@kernel.org
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220817132701.3015912-3-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ext4/inode.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index bad1792865e9..417b1b289ac1 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4386,9 +4386,17 @@ static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino, inodes_per_block = EXT4_SB(sb)->s_inodes_per_block; inode_offset = ((ino - 1) % EXT4_INODES_PER_GROUP(sb)); - block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); + block = ext4_inode_table(sb, gdp); + if ((block <= le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) || + (block >= ext4_blocks_count(EXT4_SB(sb)->s_es))) { + ext4_error(sb, "Invalid inode table block %llu in " + "block_group %u", block, iloc->block_group); + return -EFSCORRUPTED; + } + block += (inode_offset / inodes_per_block); + bh = sb_getblk(sb, block); if (unlikely(!bh)) return -ENOMEM; |