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Old 01-06-2012, 08:48 PM
Bob Peterson
 
Default Fix recent use-after-free spotted by coverity

Hi,

This patch fixes a use-after-free bug, spotted by coverity, which
was recently introduced.

Regards,

Bob Peterson
Red Hat File Systems

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
--
Author: Bob Peterson <rpeterso@redhat.com>
Date: Fri Jan 6 16:42:27 2012 -0600

GFS2: Fix a use-after-free that coverity spotted

In function gfs2_inplace_release it was trying to unlock a gfs2_holder
structure associated with a reservation, after said reservation was
freed. The problem is that the statements have the wrong order.
This patch corrects the order so that the reservation is freed after
the gfs2_holder is unlocked.

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 2223462..981bfa3 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1108,9 +1108,9 @@ void gfs2_inplace_release(struct gfs2_inode *ip)
{
struct gfs2_blkreserv *rs = ip->i_res;

- gfs2_blkrsv_put(ip);
if (rs->rs_rgd_gh.gh_gl)
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
+ gfs2_blkrsv_put(ip);
}

/**
 

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