From e0b27d98bfed9cd9a22f96996bab24858646883d Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Mon, 6 Jan 2020 13:17:34 +0000 Subject: [PATCH] NFS: Add missing null check for failed allocation Currently the allocation of buf is not being null checked and a null pointer dereference can occur when the memory allocation fails. Fix this by adding a check and returning -ENOMEM. Addresses-Coverity: ("Dereference null return") Fixes: 6d972518b821 ("NFS: Add fs_context support.") Signed-off-by: Colin Ian King Signed-off-by: Anna Schumaker --- fs/nfs/nfs4namespace.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c index 10e9e1887841..de6875a9b391 100644 --- a/fs/nfs/nfs4namespace.c +++ b/fs/nfs/nfs4namespace.c @@ -137,6 +137,9 @@ static int nfs4_validate_fspath(struct dentry *dentry, int n; buf = kmalloc(4096, GFP_KERNEL); + if (!buf) + return -ENOMEM; + path = nfs4_path(dentry, buf, 4096); if (IS_ERR(path)) { kfree(buf);