diff options
| author | Chengguang Xu <cgxu519@zoho.com.cn> | 2019-05-14 06:40:41 +0800 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2019-05-20 10:50:48 +0200 |
| commit | 02475de9bb23ed5381f0fb04a84a3c4fad90582d (patch) | |
| tree | 26adb54a3bdace85ae14c84bcb914da76ba711da /fs/ext2 | |
| parent | f44840ad1f822d9ecee6a3f91f2d17825a361307 (diff) | |
| download | linux-stable-02475de9bb23ed5381f0fb04a84a3c4fad90582d.tar.gz linux-stable-02475de9bb23ed5381f0fb04a84a3c4fad90582d.tar.bz2 linux-stable-02475de9bb23ed5381f0fb04a84a3c4fad90582d.zip | |
ext2: introduce helper for xattr header validation
Introduce helper function ext2_xattr_header_valid()
for xattr header validation and clean up the header
check ralated code.
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Chengguang Xu <cgxu519@zoho.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2')
| -rw-r--r-- | fs/ext2/xattr.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c index 1e33e0ac8cf1..db27260d6a5b 100644 --- a/fs/ext2/xattr.c +++ b/fs/ext2/xattr.c @@ -134,6 +134,16 @@ ext2_xattr_handler(int name_index) return handler; } +static bool +ext2_xattr_header_valid(struct ext2_xattr_header *header) +{ + if (header->h_magic != cpu_to_le32(EXT2_XATTR_MAGIC) || + header->h_blocks != cpu_to_le32(1)) + return false; + + return true; +} + /* * ext2_xattr_get() * @@ -176,9 +186,9 @@ ext2_xattr_get(struct inode *inode, int name_index, const char *name, ea_bdebug(bh, "b_count=%d, refcount=%d", atomic_read(&(bh->b_count)), le32_to_cpu(HDR(bh)->h_refcount)); end = bh->b_data + bh->b_size; - if (HDR(bh)->h_magic != cpu_to_le32(EXT2_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { -bad_block: ext2_error(inode->i_sb, "ext2_xattr_get", + if (!ext2_xattr_header_valid(HDR(bh))) { +bad_block: + ext2_error(inode->i_sb, "ext2_xattr_get", "inode %ld: bad block %d", inode->i_ino, EXT2_I(inode)->i_file_acl); error = -EIO; @@ -266,9 +276,9 @@ ext2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size) ea_bdebug(bh, "b_count=%d, refcount=%d", atomic_read(&(bh->b_count)), le32_to_cpu(HDR(bh)->h_refcount)); end = bh->b_data + bh->b_size; - if (HDR(bh)->h_magic != cpu_to_le32(EXT2_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { -bad_block: ext2_error(inode->i_sb, "ext2_xattr_list", + if (!ext2_xattr_header_valid(HDR(bh))) { +bad_block: + ext2_error(inode->i_sb, "ext2_xattr_list", "inode %ld: bad block %d", inode->i_ino, EXT2_I(inode)->i_file_acl); error = -EIO; @@ -406,9 +416,9 @@ ext2_xattr_set(struct inode *inode, int name_index, const char *name, le32_to_cpu(HDR(bh)->h_refcount)); header = HDR(bh); end = bh->b_data + bh->b_size; - if (header->h_magic != cpu_to_le32(EXT2_XATTR_MAGIC) || - header->h_blocks != cpu_to_le32(1)) { -bad_block: ext2_error(sb, "ext2_xattr_set", + if (!ext2_xattr_header_valid(header)) { +bad_block: + ext2_error(sb, "ext2_xattr_set", "inode %ld: bad block %d", inode->i_ino, EXT2_I(inode)->i_file_acl); error = -EIO; @@ -784,8 +794,7 @@ ext2_xattr_delete_inode(struct inode *inode) goto cleanup; } ea_bdebug(bh, "b_count=%d", atomic_read(&(bh->b_count))); - if (HDR(bh)->h_magic != cpu_to_le32(EXT2_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { + if (!ext2_xattr_header_valid(HDR(bh))) { ext2_error(inode->i_sb, "ext2_xattr_delete_inode", "inode %ld: bad block %d", inode->i_ino, EXT2_I(inode)->i_file_acl); |