From 294f2ad5a545eb71d397623743ddd8201131bdad Mon Sep 17 00:00:00 2001 From: Abhijith Das Date: Wed, 18 Jul 2012 11:56:59 -0400 Subject: [PATCH] GFS2: kernel panic with small gfs2 filesystems - 1 RG In the unlikely setup where there's only one resource group in the gfs2 filesystem, gfs2_rgrpd_get_next() returns a NULL rgd that is not dealt with properly, causing a kernel NULL ptr dereference. This patch fixes this issue. Signed-off-by: Abhi Das Signed-off-by: Steven Whitehouse --- fs/gfs2/rgrp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index e53d0a1..fb70792 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -1276,6 +1276,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested) /* fall through */ case GLR_TRYFAILED: rgd = gfs2_rgrpd_get_next(rgd); + rgd = rgd ? : begin; /* if NULL, wrap */ if (rgd != begin) /* If we didn't wrap */ break; -- 2.7.4