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ext4: replace bogus assertion in ext4_xattr_shift_entries()

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We were checking whether computed offsets do not exceed end of block in
ext4_xattr_shift_entries(). However this does not make sense since we
always only decrease offsets. So replace that assertion with a check
whether we really decrease xattrs value offsets.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2016-08-29 15:41:11 -04:00 committed by Theodore Ts'o
parent 1cba423707
commit 9440571388
1 changed files with 5 additions and 4 deletions
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9
fs/ext4/xattr.c
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@ -1319,18 +1319,19 @@ ext4_xattr_set(struct inode *inode, int name_index, const char *name,
*/ */
static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry,
int value_offs_shift, void *to, int value_offs_shift, void *to,
void *from, size_t n, int blocksize) void *from, size_t n)
{ {
struct ext4_xattr_entry *last = entry; struct ext4_xattr_entry *last = entry;
int new_offs; int new_offs;
/* We always shift xattr headers further thus offsets get lower */
BUG_ON(value_offs_shift > 0);
/* Adjust the value offsets of the entries */ /* Adjust the value offsets of the entries */
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
if (last->e_value_size) { if (last->e_value_size) {
new_offs = le16_to_cpu(last->e_value_offs) + new_offs = le16_to_cpu(last->e_value_offs) +
value_offs_shift; value_offs_shift;
BUG_ON(new_offs + le32_to_cpu(last->e_value_size)
> blocksize);
last->e_value_offs = cpu_to_le16(new_offs); last->e_value_offs = cpu_to_le16(new_offs);
} }
} }
@ -1542,7 +1543,7 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize
- new_extra_isize, (void *)raw_inode + - new_extra_isize, (void *)raw_inode +
EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
(void *)header, total_ino, inode->i_sb->s_blocksize); (void *)header, total_ino);
EXT4_I(inode)->i_extra_isize = new_extra_isize; EXT4_I(inode)->i_extra_isize = new_extra_isize;
brelse(bh); brelse(bh);
out: out: