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| author | Tahsin Erdogan <tahsin@google.com> | 2017-08-14 08:30:06 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-08-14 08:30:06 -0400 |
| commit | 32aaf194201e98db4235b7b71ac62a22e2ac355f (patch) | |
| tree | ae4a63af40995527827573cc0aa921540727a22b /fs/ext4/xattr.c | |
| parent | b80b32b6d5e79798b85cd4644206aaa069059390 (diff) | |
| download | linux-32aaf194201e98db4235b7b71ac62a22e2ac355f.tar.gz linux-32aaf194201e98db4235b7b71ac62a22e2ac355f.tar.bz2 linux-32aaf194201e98db4235b7b71ac62a22e2ac355f.zip | |
ext4: add missing xattr hash update
When updating an extended attribute, if the padded value sizes are the
same, a shortcut is taken to avoid the bulk of the work. This was fine
until the xattr hash update was moved inside ext4_xattr_set_entry().
With that change, the hash update got missed in the shortcut case.
Thanks to ZhangYi (yizhang089@gmail.com) for root causing the problem.
Fixes: daf8328172df ("ext4: eliminate xattr entry e_hash recalculation for removes")
Reported-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 82a5af9f6668..3dd970168448 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1543,7 +1543,7 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info *i, /* Clear padding bytes. */ memset(val + i->value_len, 0, new_size - i->value_len); } - return 0; + goto update_hash; } /* Compute min_offs and last. */ @@ -1707,6 +1707,7 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info *i, here->e_value_size = cpu_to_le32(i->value_len); } +update_hash: if (i->value) { __le32 hash = 0; @@ -1725,7 +1726,8 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info *i, here->e_name_len, &crc32c_hash, 1); } else if (is_block) { - __le32 *value = s->base + min_offs - new_size; + __le32 *value = s->base + le16_to_cpu( + here->e_value_offs); hash = ext4_xattr_hash_entry(here->e_name, here->e_name_len, value, |