linux-kernel - [PATCH][next] NFSv4.2: fix error return on memory allocation failure

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Message-Id: <20201216122513.15004-1-colin.king@canonical.com>
Date:   Wed, 16 Dec 2020 12:25:13 +0000
From:   Colin King <colin.king@...onical.com>
To:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Frank van der Linden <fllinden@...zon.com>,
        linux-nfs@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] NFSv4.2: fix error return on memory allocation failure

From: Colin Ian King <colin.king@...onical.com>

Currently when an alloc_page fails the error return is not set in
variable err and a garbage initialized value is returned. Fix this
by setting err to -ENOMEM before taking the error return path.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: a1f26739ccdc ("NFSv4.2: improve page handling for GETXATTR")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/nfs/nfs42proc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index b9836e2ce4a2..f3fd935620fc 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -1301,6 +1301,7 @@ ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
 		pages[i] = alloc_page(GFP_KERNEL);
 		if (!pages[i]) {
 			np = i + 1;
+			err = -ENOMEM;
 			goto out;
 		}
 	}
-- 
2.29.2