Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e7ca2552 authored by Mateusz Guzik's avatar Mateusz Guzik Committed by Linus Torvalds
Browse files

ipc: fix compat msgrcv with negative msgtyp 



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: default avatarMateusz Guzik <mguzik@redhat.com>
Reported-by: default avatarGabriellla Schmidt <gsc@bruker.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ffa571da

ipc/compat.c

+1 −1
Original line number Diff line number Diff line
@@ -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: