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path: root/fs/gfs2/rgrp.c
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Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 370c29b536e..66b6d4d8b1d 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1496,11 +1496,19 @@ int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
struct gfs2_alloc *al = ip->i_alloc;
- struct gfs2_rgrpd *rgd = al->al_rgd;
+ struct gfs2_rgrpd *rgd;
u32 goal, blk;
u64 block;
int error;
+ /* Only happens if there is a bug in gfs2, return something distinctive
+ * to ensure that it is noticed.
+ */
+ if (al == NULL)
+ return -ECANCELED;
+
+ rgd = al->al_rgd;
+
if (rgrp_contains_block(rgd, ip->i_goal))
goal = ip->i_goal - rgd->rd_data0;
else