linux-kernel - [PATCH 4.17 184/324] RISC-V: fix R_RISCV_ADD32/R_RISCV

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Message-Id: <20180823075005.405817127@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:54:10 +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, Andreas Schwab <schwab@...e.de>,
        Palmer Dabbelt <palmer@...ive.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 184/324] RISC-V: fix R_RISCV_ADD32/R_RISCV_SUB32 relocations

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andreas Schwab <schwab@...e.de>

[ Upstream commit 781c8fe2da3d2c7c95cd7ffddbab63b80a79da4d ]

The R_RISCV_ADD32/R_RISCV_SUB32 relocations should add/subtract the
address of the symbol (without overflow check), not its contents.

Signed-off-by: Andreas Schwab <schwab@...e.de>
Signed-off-by: Palmer Dabbelt <palmer@...ive.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/riscv/kernel/module.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -252,14 +252,14 @@ static int apply_r_riscv_align_rela(stru
 static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
 				    Elf_Addr v)
 {
-	*(u32 *)location += (*(u32 *)v);
+	*(u32 *)location += (u32)v;
 	return 0;
 }
 
 static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
 				    Elf_Addr v)
 {
-	*(u32 *)location -= (*(u32 *)v);
+	*(u32 *)location -= (u32)v;
 	return 0;
 }