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ceph: fix possible double-free of mds request reference 

Clear pointer to mds request after dropping the reference to
ensure we don't drop it again, as there is at least one error
path through this function that does not reset fi->last_readdir
to a new value.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-10 12:03:32 -08:00
parent d96d60498f
commit 393f662096
1 changed files with 3 additions and 1 deletions
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4
fs/ceph/dir.c
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@ -288,8 +288,10 @@ more:
CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
/* discard old result, if any */ /* discard old result, if any */
if (fi->last_readdir) if (fi->last_readdir) {
ceph_mdsc_put_request(fi->last_readdir); ceph_mdsc_put_request(fi->last_readdir);
fi->last_readdir = NULL;
}
/* requery frag tree, as the frag topology may have changed */ /* requery frag tree, as the frag topology may have changed */
frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);