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| author | Jan Kara <jack@suse.cz> | 2016-08-11 17:58:32 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-08-11 17:58:32 +0200 |
| commit | 418c12d08dc64a45107c467ec1ba29b5e69b0715 (patch) | |
| tree | c84aef7969bd10258a47e545e926a548d5a16f01 | |
| parent | ext4: fix xattr shifting when expanding inodes (diff) | |
| download | linux-418c12d08dc64a45107c467ec1ba29b5e69b0715.tar.xz linux-418c12d08dc64a45107c467ec1ba29b5e69b0715.zip | |
ext4: fix xattr shifting when expanding inodes part 2
When multiple xattrs need to be moved out of inode, we did not properly
recompute total size of xattr headers in the inode and the new header
position. Thus when moving the second and further xattr we asked
ext4_xattr_shift_entries() to move too much and from the wrong place,
resulting in possible xattr value corruption or general memory
corruption.
CC: stable@vger.kernel.org # 4.4.x
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/xattr.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index cb1d7b4482de..b18b1ff7cc27 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1516,6 +1516,7 @@ retry: error = ext4_xattr_ibody_set(handle, inode, &i, is); if (error) goto cleanup; + total_ino -= entry_size; entry = IFIRST(header); if (entry_size + EXT4_XATTR_SIZE(size) >= isize_diff) @@ -1526,11 +1527,11 @@ retry: ext4_xattr_shift_entries(entry, -shift_bytes, (void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE + EXT4_I(inode)->i_extra_isize + shift_bytes, - (void *)header, total_ino - entry_size, - inode->i_sb->s_blocksize); + (void *)header, total_ino, inode->i_sb->s_blocksize); isize_diff -= shift_bytes; EXT4_I(inode)->i_extra_isize += shift_bytes; + header = IHDR(inode, raw_inode); i.name = b_entry_name; i.value = buffer; |