linux-kernel - [PATCH 5.19 1155/1157] powerpc/kexec: Fix build failure from uninitialised variable

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Message-Id: <20220815180526.750054495@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:08:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Russell Currey <ruscur@...sell.cc>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.19 1155/1157] powerpc/kexec: Fix build failure from uninitialised variable

From: Russell Currey <ruscur@...sell.cc>

commit 83ee9f23763a432a4077bf20624ee35de87bce99 upstream.

clang 14 won't build because ret is uninitialised and can be returned if
both prop and fdtprop are NULL.  Drop the ret variable and return an
error in that failure case.

Fixes: b1fc44eaa9ba ("pseries/iommu/ddw: Fix kdump to work in absence of ibm,dma-window")
Suggested-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Russell Currey <ruscur@...sell.cc>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220810054331.373761-1-ruscur@russell.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/kexec/file_load_64.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -1043,17 +1043,17 @@ static int copy_property(void *fdt, int
 			 const char *propname)
 {
 	const void *prop, *fdtprop;
-	int len = 0, fdtlen = 0, ret;
+	int len = 0, fdtlen = 0;
 
 	prop = of_get_property(dn, propname, &len);
 	fdtprop = fdt_getprop(fdt, node_offset, propname, &fdtlen);
 
 	if (fdtprop && !prop)
-		ret = fdt_delprop(fdt, node_offset, propname);
+		return fdt_delprop(fdt, node_offset, propname);
 	else if (prop)
-		ret = fdt_setprop(fdt, node_offset, propname, prop, len);
-
-	return ret;
+		return fdt_setprop(fdt, node_offset, propname, prop, len);
+	else
+		return -FDT_ERR_NOTFOUND;
 }
 
 static int update_pci_dma_nodes(void *fdt, const char *dmapropname)