linux-kernel - [PATCH 3.18 26/68] powerpc/ptrace: Fix out of bounds array access warning

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Date:   Fri,  5 May 2017 11:32:11 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Khem Raj <raj.khem@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 3.18 26/68] powerpc/ptrace: Fix out of bounds array access warning

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

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

From: Khem Raj <raj.khem@...il.com>

commit 1e407ee3b21f981140491d5b8a36422979ca246f upstream.

gcc-6 correctly warns about a out of bounds access

arch/powerpc/kernel/ptrace.c:407:24: warning: index 32 denotes an offset greater than size of 'u64[32][1] {aka long long unsigned int[32][1]}' [-Warray-bounds]
        offsetof(struct thread_fp_state, fpr[32][0]));
                        ^

check the end of array instead of beginning of next element to fix this

Signed-off-by: Khem Raj <raj.khem@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Segher Boessenkool <segher@...nel.crashing.org>
Tested-by: Aaro Koskinen <aaro.koskinen@....fi>
Acked-by: Olof Johansson <olof@...om.net>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/ptrace.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -376,7 +376,7 @@ static int fpr_get(struct task_struct *t
 
 #else
 	BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
-		     offsetof(struct thread_fp_state, fpr[32][0]));
+		     offsetof(struct thread_fp_state, fpr[32]));
 
 	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				   &target->thread.fp_state, 0, -1);
@@ -404,7 +404,7 @@ static int fpr_set(struct task_struct *t
 	return 0;
 #else
 	BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
-		     offsetof(struct thread_fp_state, fpr[32][0]));
+		     offsetof(struct thread_fp_state, fpr[32]));
 
 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				  &target->thread.fp_state, 0, -1);