This is a note to let you know that I've just added the patch titled
ext4: optimize ea_inode block expansion
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-optimize-ea_inode-block-expansion.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1e9d62d252812575ded7c620d8fc67c32ff06c16 Mon Sep 17 00:00:00 2001
From: Jun Nie <jun.nie@xxxxxxxxxx>
Date: Tue, 3 Jan 2023 09:45:16 +0800
Subject: ext4: optimize ea_inode block expansion
From: Jun Nie <jun.nie@xxxxxxxxxx>
commit 1e9d62d252812575ded7c620d8fc67c32ff06c16 upstream.
Copy ea data from inode entry when expanding ea block if possible.
Then remove the ea entry if expansion success. Thus memcpy to a
temporary buffer may be avoided.
If the expansion fails, we do not need to recovery the removed ea
entry neither in this way.
Reported-by: syzbot+2dacb8f015bf1420155f@xxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08
Link: https://lore.kernel.org/r/20230103014517.495275-2-jun.nie@xxxxxxxxxx
Cc: stable@xxxxxxxxxx
Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/xattr.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2583,9 +2583,8 @@ static int ext4_xattr_move_to_block(hand
is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
- buffer = kvmalloc(value_size, GFP_NOFS);
b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
- if (!is || !bs || !buffer || !b_entry_name) {
+ if (!is || !bs || !b_entry_name) {
error = -ENOMEM;
goto out;
}
@@ -2597,12 +2596,18 @@ static int ext4_xattr_move_to_block(hand
/* Save the entry name and the entry value */
if (entry->e_value_inum) {
+ buffer = kvmalloc(value_size, GFP_NOFS);
+ if (!buffer) {
+ error = -ENOMEM;
+ goto out;
+ }
+
error = ext4_xattr_inode_get(inode, entry, buffer, value_size);
if (error)
goto out;
} else {
size_t value_offs = le16_to_cpu(entry->e_value_offs);
- memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size);
+ buffer = (void *)IFIRST(header) + value_offs;
}
memcpy(b_entry_name, entry->e_name, entry->e_name_len);
@@ -2617,25 +2622,26 @@ static int ext4_xattr_move_to_block(hand
if (error)
goto out;
- /* Remove the chosen entry from the inode */
- error = ext4_xattr_ibody_set(handle, inode, &i, is);
- if (error)
- goto out;
-
i.value = buffer;
i.value_len = value_size;
error = ext4_xattr_block_find(inode, &i, bs);
if (error)
goto out;
- /* Add entry which was removed from the inode into the block */
+ /* Move ea entry from the inode into the block */
error = ext4_xattr_block_set(handle, inode, &i, bs);
if (error)
goto out;
- error = 0;
+
+ /* Remove the chosen entry from the inode */
+ i.value = NULL;
+ i.value_len = 0;
+ error = ext4_xattr_ibody_set(handle, inode, &i, is);
+
out:
kfree(b_entry_name);
- kvfree(buffer);
+ if (entry->e_value_inum && buffer)
+ kvfree(buffer);
if (is)
brelse(is->iloc.bh);
if (bs)
Patches currently in stable-queue which might be from jun.nie@xxxxxxxxxx are
queue-4.19/ext4-optimize-ea_inode-block-expansion.patch
queue-4.19/ext4-refuse-to-create-ea-block-when-umounted.patch
