Commit 0ccfbd4d authored Jun 22, 2017 by Jeff Mahoney Committed by Greg Kroah-Hartman Jan 31, 2018

reiserfs: don't preallocate blocks for extended attributes



commit 54930dfeb46e978b447af0fb8ab4e181c1bf9d7a upstream.

Most extended attributes will fit in a single block.  More importantly,
we drop the reference to the inode while holding the transaction open
so the preallocated blocks aren't released.  As a result, the inode
may be evicted before it's removed from the transaction's prealloc list
which can cause memory corruption.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent b7d25282

fs/reiserfs/bitmap.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1136,7 +1136,7 @@ static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint)
		hint->prealloc_size = 0;

		if (!hint->formatted_node && hint->preallocate) {
		if (S_ISREG(hint->inode->i_mode)
		if (S_ISREG(hint->inode->i_mode) && !IS_PRIVATE(hint->inode)
		&& hint->inode->i_size >=
		REISERFS_SB(hint->th->t_super)->s_alloc_options.
		preallocmin * hint->inode->i_sb->s_blocksize)