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sparc64: Fix sparc64_set_context stack handling.

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[ Upstream commit 397d1533b6 ]

Like a signal return, we should use synchronize_user_stack() rather
than flush_user_windows().

Reported-by: Ilya Malakhov <ilmalakhovthefirst@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David S. Miller 2016-03-01 00:25:32 -05:00 committed by Greg Kroah-Hartman
parent 4185bd68ef
commit b120609082
1 changed files with 1 additions and 1 deletions
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2
arch/sparc/kernel/signal_64.c
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@ -52,7 +52,7 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
unsigned char fenab;
int err;
flush_user_windows();
synchronize_user_stack();
if (get_thread_wsaved() ||
(((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
(!__access_ok(ucp, sizeof(*ucp))))