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Subject[PATCH][next] NFS: Add missing null check for failed allocation
Date
From: Colin Ian King <colin.king@canonical.com>

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 <colin.king@canonical.com>
---
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);
--
2.24.0
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