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tile/ptrace: Preserve previous registers for short regset write

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Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
This commit is contained in:
Dave Martin 2017-01-06 17:54:51 +00:00 committed by Chris Metcalf
parent 0c744ea4f7
commit fd7c99142d
1 changed files with 1 additions and 1 deletions
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arch/tile/kernel/ptrace.c
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@ -111,7 +111,7 @@ static int tile_gpr_set(struct task_struct *target,
const void *kbuf, const void __user *ubuf)
{
int ret;
struct pt_regs regs;
struct pt_regs regs = *task_pt_regs(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
sizeof(regs));