[PATCH 3.12 011/122] ipc/compat_sys_msgrcv: change msgtyp type from long to compat_long_t

[Jiri Slaby]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 291fdb0bcebd5e8db6af767c1fdc522167dad73d upstream.

Change the type of compat_sys_msgrcv's msgtyp parameter from long
to compat_long_t, since compat user space passes only a 32 bit signed
value.
Let the compat wrapper do proper sign extension to 64 bit of this
parameter.

Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 include/linux/compat.h | 2 +-
 ipc/compat.c           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 0f62cb7a4ff0..afea0d19b37a 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -318,7 +318,7 @@ asmlinkage long compat_sys_semctl(int semid, int semnum, int cmd, int arg);
 asmlinkage long compat_sys_msgsnd(int msqid, compat_uptr_t msgp,
 		compat_ssize_t msgsz, int msgflg);
 asmlinkage long compat_sys_msgrcv(int msqid, compat_uptr_t msgp,
-		compat_ssize_t msgsz, long msgtyp, int msgflg);
+		compat_ssize_t msgsz, compat_long_t msgtyp, int msgflg);
 long compat_sys_msgctl(int first, int second, void __user *uptr);
 long compat_sys_shmctl(int first, int second, void __user *uptr);
 long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
diff --git a/ipc/compat.c b/ipc/compat.c
index d3b376025e9b..e0012184f65e 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -430,9 +430,9 @@ COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
 }
 
 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
-		       compat_ssize_t, msgsz, long, msgtyp, int, msgflg)
+		       compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
 {
-	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, msgtyp,
+	return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
 			 msgflg, compat_do_msg_fill);
 }
 
-- 
2.2.2

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