um: ->restart_block.fn needs to be reset on sigreturn

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c
index 4883b9546016..72eafa6c6a52 100644
--- a/arch/x86/um/signal.c
+++ b/arch/x86/um/signal.c
@@ -156,6 +156,9 @@ static int copy_sc_from_user(struct pt_regs *regs,
         struct sigcontext sc;
         int err, pid;
 
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
         err = copy_from_user(&sc, from, sizeof(sc));
         if (err)
                 return err;