[MIPS] Fix sigset_t endianess swapping issues in 32-bit compat code.

access_ok in compat-signal.h is wrong (checking destination instead of
source) and redundant (already checked before calling this function).

Also sf_mask in struct sigframe32 should be compat_sigset_t type.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 2 insertions, 5 deletions

diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index c28cb21514c8..9f829f63024b 100644
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -150,7 +150,7 @@ struct sigframe32 {
         u32 sf_ass[4];          /* argument save space for o32 */
         u32 sf_code[2];         /* signal trampoline */
         struct sigcontext32 sf_sc;
-        sigset_t sf_mask;
+        compat_sigset_t sf_mask;
 };
 
 struct rt_sigframe32 {
@@ -166,7 +166,7 @@ struct sigframe32 {
         u32 sf_ass[4];                  /* argument save space for o32 */
         u32 sf_pad[2];
         struct sigcontext32 sf_sc;      /* hw context */
-        sigset_t sf_mask;
+        compat_sigset_t sf_mask;
         u32 sf_code[8] ____cacheline_aligned;   /* signal trampoline */
 };
 
diff --git a/include/asm-mips/compat-signal.h b/include/asm-mips/compat-signal.h
index 672077084aa1..d6e7c3b4119a 100644
--- a/include/asm-mips/compat-signal.h
+++ b/include/asm-mips/compat-signal.h
@@ -33,9 +33,6 @@ static inline int __copy_conv_sigset_from_user(sigset_t *d,
         BUG_ON(sizeof(*d) != sizeof(*s));
         BUG_ON(_NSIG_WORDS != 2);
 
-        if (unlikely(!access_ok(VERIFY_READ, d, sizeof(*d))))
-                return -EFAULT;
-
 #ifdef CONFIG_CPU_BIG_ENDIAN
         err  = __get_user(u->c.sig[1], &s->sig[0]);
         err |= __get_user(u->c.sig[0], &s->sig[1]);