From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christian Gmeiner , Will Deacon , Jon Medhurst , Russell King Subject: [PATCH 3.12 015/118] ARM: 7917/1: cacheflush: correctly limit range of memory region being flushed Date: Wed, 18 Dec 2013 13:10:52 -0800 Message-Id: <20131218211219.899085789@linuxfoundation.org> In-Reply-To: <20131218211219.461663463@linuxfoundation.org> References: <20131218211219.461663463@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jon Medhurst commit b31459adeab018b297541e288ac88873011da82a upstream. The __do_cache_op function operates with a 'chunk' size of one page but fails to limit the size of the final chunk so as to not exceed the specified memory region. Fix this. Reported-by: Christian Gmeiner Tested-by: Christian Gmeiner Acked-by: Will Deacon Signed-off-by: Jon Medhurst Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- arch/arm/kernel/traps.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -503,9 +503,10 @@ static inline int __do_cache_op(unsigned long start, unsigned long end) { int ret; - unsigned long chunk = PAGE_SIZE; do { + unsigned long chunk = min(PAGE_SIZE, end - start); + if (signal_pending(current)) { struct thread_info *ti = current_thread_info();