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reiserfs: don't preallocate blocks for extended attributes

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commit 54930dfeb4 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>
This commit is contained in:
Jeff Mahoney
2017-06-22 16:35:04 -04:00
committed by Greg Kroah-Hartman
parent b7d25282b7
commit 0ccfbd4d6f
1 changed files with 1 additions and 1 deletions
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2
fs/reiserfs/bitmap.c
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@@ -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)