Compat function takes msgtyp argument as u32 and passes it down to
do_msgrcv which results in casting to long, thus the sign is lost
and we get a big positive number instead.
Cast the argument to signed type before passing it down.
Signed-off-by: Mateusz Guzik <[email protected]>
Reported-by: Gabriellla Schmidt <[email protected]>
Cc: Al Viro <[email protected]>
---
ipc/compat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/ipc/compat.c b/ipc/compat.c
index 892f658..d3b3760 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -381,7 +381,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
uptr = compat_ptr(ipck.msgp);
fifth = ipck.msgtyp;
}
- return do_msgrcv(first, uptr, second, fifth, third,
+ return do_msgrcv(first, uptr, second, (s32)fifth, third,
compat_do_msg_fill);
}
case MSGGET:
--
1.8.3.1