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f2fs: fix to adapt small inline xattr space in __find_inline_xattr()

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With below testcase, we will fail to find existed xattr entry:

1. mkfs.f2fs -O extra_attr -O flexible_inline_xattr /dev/zram0
2. mount -t f2fs -o inline_xattr_size=1 /dev/zram0 /mnt/f2fs/
3. touch /mnt/f2fs/file
4. setfattr -n "user.name" -v 0 /mnt/f2fs/file
5. getfattr -n "user.name" /mnt/f2fs/file

/mnt/f2fs/file: user.name: No such attribute

The reason is for inode which has very small inline xattr size,
__find_inline_xattr() will fail to traverse any entry due to first
entry may not be loaded from xattr node yet, later, we may skip to
check entire xattr datas in __find_xattr(), result in such wrong
condition.

This patch adds condition to check such case to avoid this issue.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2019-03-05 19:32:26 +08:00 committed by Jaegeuk Kim
parent dd6c89b5f2
commit 2c28aba8b2
1 changed files with 10 additions and 3 deletions
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13
fs/f2fs/xattr.c
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@ -224,11 +224,11 @@ static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
{
struct f2fs_xattr_entry *entry;
unsigned int inline_size = inline_xattr_size(inode);
void *max_addr = base_addr + inline_size;
list_for_each_xattr(entry, base_addr) {
if ((void *)entry + sizeof(__u32) > base_addr + inline_size ||
(void *)XATTR_NEXT_ENTRY(entry) + sizeof(__u32) >
base_addr + inline_size) {
if ((void *)entry + sizeof(__u32) > max_addr ||
(void *)XATTR_NEXT_ENTRY(entry) > max_addr) {
*last_addr = entry;
return NULL;
}
@ -239,6 +239,13 @@ static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,
if (!memcmp(entry->e_name, name, len))
break;
}
/* inline xattr header or entry across max inline xattr size */
if (IS_XATTR_LAST_ENTRY(entry) &&
(void *)entry + sizeof(__u32) > max_addr) {
*last_addr = entry;
return NULL;
}
return entry;
}