ipc/compat_sys_msgrcv: change msgtyp type from long to compat_long_t

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@de.ibm.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 4c42df3fce37..179b1da9e19f 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -321,7 +321,7 @@ 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 f486b0096a67..e1f4ab65660c 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);
 }