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authorAbhijith Das <adas@redhat.com>2012-07-18 19:56:59 +0400
committerSteven Whitehouse <swhiteho@redhat.com>2012-07-18 19:45:13 +0400
commit294f2ad5a545eb71d397623743ddd8201131bdad (patch)
tree7389ffbbef4562a2aa80b6e73a063229481fbc4c /fs/gfs2/rgrp.c
parent44b8db13860a449b5d85afdc65da654ce56da678 (diff)
downloadlinux-294f2ad5a545eb71d397623743ddd8201131bdad.tar.xz
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 <adas@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index e53d0a1c234f..fb7079263ea7 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;