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GFS2: fix potential NULL pointer dereference

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Commit [e66cf1610: GFS2: Use lockref for glocks] replaced call:
    atomic_read(&gi->gl->gl_ref) == 0
with:
    __lockref_is_dead(&gl->gl_lockref)
therefore changing how gl is accessed, from gi->gl to plan gl.
However, gl can be a NULL pointer, and so gi->gl needs to be
used instead (which is guaranteed not to be NULL because fo
the while loop checking that condition).

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Michal Nazarewicz 2013-11-12 13:30:05 +01:00 committed by Steven Whitehouse
parent 527d151131
commit e3c4269d13
1 changed files with 2 additions and 1 deletions
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3
fs/gfs2/glock.c
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@ -1899,7 +1899,8 @@ static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
gi->nhash = 0;
}
/* Skip entries for other sb and dead entries */
} while (gi->sdp != gi->gl->gl_sbd || __lockref_is_dead(&gl->gl_lockref));
} while (gi->sdp != gi->gl->gl_sbd ||
__lockref_is_dead(&gi->gl->gl_lockref));
return 0;
}