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Date: Sun, 6 Aug 2017 13:03:19 -0700 From: Tahsin Erdogan <tahsin@...gle.com> To: Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger@...ger.ca>, Miklos Szeredi <miklos@...redi.hu>, zhangyi <yizhang089@...il.com>, linux-ext4@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Tahsin Erdogan <tahsin@...gle.com> Subject: [PATCH] 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@...il.com) for root causing the problem. Fixes: daf8328172df ("ext4: eliminate xattr entry e_hash recalculation for removes") Reported-by: Miklos Szeredi <miklos@...redi.hu> Signed-off-by: Tahsin Erdogan <tahsin@...gle.com> --- fs/ext4/xattr.c | 6 ++++-- 1 file 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, -- 2.14.0.rc1.383.gd1ce394fe2-goog
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