Patch "MIPS: ptrace: Fix regs_return_value for kernel context" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

MIPS: ptrace: Fix regs_return_value for kernel context

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mips-ptrace-fix-regs_return_value-for-kernel-context.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Marcin Nowakowski <[email protected]>
Date: Wed, 12 Oct 2016 09:32:56 +0200
Subject: MIPS: ptrace: Fix regs_return_value for kernel context

From: Marcin Nowakowski <[email protected]>

commit 74f1077b5b783e7bf4fa3007cefdc8dbd6c07518 upstream.

Currently regs_return_value always negates reg[2] if it determines the syscall has failed, but when called in kernel context this check is invalid and may result in returning a wrong value.

This fixes errors reported by CONFIG_KPROBES_SANITY_TEST

Patchwork: https://patchwork.linux-mips.org/patch/14381/

---
 arch/mips/include/asm/ptrace.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -152,7 +152,7 @@ static inline int is_syscall_success(str
 
 static inline long regs_return_value(struct pt_regs *regs)
 {
-	if (is_syscall_success(regs))
+	if (is_syscall_success(regs) || !user_mode(regs))
 		return regs->regs[2];
 	else
 		return -regs->regs[2];

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mips-ptrace-fix-regs_return_value-for-kernel-context.patch