[GFS2] possible null pointer dereference fixup

gfs2_alloc_get may fail so we have to check it to prevent
NULL pointer dereference.

Signed-off-by: Cyrill Gorcunov <gorcunov@gamil.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index a08dabd6ce90..636bccfd2bcf 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -617,8 +617,9 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
         int err = -EIO;
 
         if (gfs2_is_stuffed(ip)) {
-                struct gfs2_alloc *al = NULL;
-                al = gfs2_alloc_get(ip);
+                struct gfs2_alloc *al = gfs2_alloc_get(ip);
+                if (!al)
+                        return -ENOMEM;
                 /* just request 1 blk */
                 al->al_requested = 1;
                 gfs2_inplace_reserve(ip);
@@ -729,6 +730,10 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 
         if (nalloc) {
                 al = gfs2_alloc_get(ip);
+                if (!al) {
+                        error = -ENOMEM;
+                        goto out_gunlock;
+                }
 
                 al->al_requested = nalloc * (data_blocks + ind_blocks);