[PATCH] select: Fix unbalanced user_access_end()

[Christophe Leroy]

While working on implementing user access validation on powerpc
I got the following warnings on a pmac32_defconfig build:

          CC      fs/select.o
        fs/select.o: warning: objtool: sys_pselect6+0x1bc: redundant UACCESS 
disable
        fs/select.o: warning: objtool: sys_pselect6_time32+0x1bc: redundant 
UACCESS disable

On powerpc/32s, user_read_access_begin/end() are no-ops, but the
failure path has a user_access_end() instead of user_read_access_end()
which means an access end without any prior access begin.

Replace that user_access_end() by user_read_access_end().

Fixes: 7e71609f64ec ("pselect6() and friends: take handling the combined 
6th/7th args into helper")
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 fs/select.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index e223d1fe9d55..7da531b1cf6b 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -786,7 +786,7 @@ static inline int get_sigset_argpack(struct sigset_argpack 
*to,
        }
        return 0;
 Efault:
-       user_access_end();
+       user_read_access_end();
        return -EFAULT;
 }
 
@@ -1355,7 +1355,7 @@ static inline int get_compat_sigset_argpack(struct 
compat_sigset_argpack *to,
        }
        return 0;
 Efault:
-       user_access_end();
+       user_read_access_end();
        return -EFAULT;
 }
 
-- 
2.47.0