[git commit branch/0.9.33] nptl: sh: fix race condition in lll_wait_tid

[Carmelo Amoroso]

commit: http://git.uclibc.org/uClibc/commit/?id=ffd9e147b120e9c2bf30ba4861860f1bc59362c5
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/0.9.33

Make a local copy of the tid value to avoid a race condition,
as the value could have been changed to 0, thus using a pointer
it would have been passed to the lll_futex_wait modified.

Signed-off-by: Stas Sergeev <stsp at users.sourceforge.net>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
(cherry picked from commit 0dcc13bf7a61b1d0708e5dd103d5515e0ffec79a)

Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
---
 .../nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
index d10cd61..b83d863 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h
@@ -396,9 +396,9 @@ extern int __lll_unlock_wake (int *__futex, int private) attribute_hidden;
 
 #define lll_wait_tid(tid) \
   do {									      \
-    __typeof (tid) *__tid = &(tid);					      \
-    while (*__tid != 0)							      \
-      lll_futex_wait (__tid, *__tid, LLL_SHARED);			      \
+    __typeof (tid) __tid;						      \
+    while ((__tid = (tid)) != 0)						      \
+      lll_futex_wait (&(tid), __tid, LLL_SHARED);			      \
   } while (0)
 
 extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)