[PATCH] xfs: check the return value of krealloc() in xfs_uuid_mount

[Qinglang Miao]

krealloc() may fail to expand the memory space. Add sanity checks to it,
and WARN() if that really happened.

Fixes: 771915c4f688 ("xfs: remove kmem_realloc()")
Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
---
 fs/xfs/xfs_mount.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 150ee5cb8..c07f48c32 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -80,9 +80,13 @@ xfs_uuid_mount(
        }
 
        if (hole < 0) {
-               xfs_uuid_table = krealloc(xfs_uuid_table,
+               uuid_t *if_xfs_uuid_table;
+               if_xfs_uuid_table = krealloc(xfs_uuid_table,
                        (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
                        GFP_KERNEL | __GFP_NOFAIL);
+               if (!if_xfs_uuid_table)
+                       goto out_duplicate;
+               xfs_uuid_table = if_xfs_uuid_table;
                hole = xfs_uuid_table_size++;
        }
        xfs_uuid_table[hole] = *uuid;
-- 
2.23.0