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| author |   Chao Yu <yuchao0@huawei.com> | 2019-03-05 19:32:26 +0800 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2019-03-12 19:02:26 -0700 |
| commit | 2c28aba8b2e2a51749fa66e01b68e1cd5b53e022 (patch) | |
| tree | 618e6bebbaf4daaae08c21f26fbae247461100ef /fs | |
| parent | f2fs: fix to do sanity check with inode.i_inline_xattr_size (diff) | |
| download | linux-dev-2c28aba8b2e2a51749fa66e01b68e1cd5b53e022.tar.xz linux-dev-2c28aba8b2e2a51749fa66e01b68e1cd5b53e022.zip | |
f2fs: fix to adapt small inline xattr space in __find_inline_xattr()
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/xattr.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index ca47224d78ab..848a785abe25 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -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; } |