linux-kernel - [PATCH] x86/intel_rdt: fix rdt

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Message-Id: <20161108134233.1803001-1-arnd@arndb.de>
Date:   Tue,  8 Nov 2016 14:42:03 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Arnd Bergmann <arnd@...db.de>, Fenghua Yu <fenghua.yu@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/intel_rdt: fix rdt_mount error handling

The newly introduced rdt_mount function returns an unintialized
pointer if rdtgroup_create_info_dir() fails:

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c: In function ‘rdt_mount’:
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c:710:9: error: ‘dentry’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

Clearly the intention was to propagate the error code here as we
do in the other failure cases.

Fixes: 5ff193fbde20 ("x86/intel_rdt: Add basic resctrl filesystem support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index a90ad22b9823..e66c7a58505e 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -691,8 +691,10 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
 	closid_init();
 
 	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
-	if (ret)
+	if (ret) {
+		dentry = ERR_PTR(ret);
 		goto out_cdp;
+	}
 
 	dentry = kernfs_mount(fs_type, flags, rdt_root,
 			      RDTGROUP_SUPER_MAGIC, NULL);
-- 
2.9.0