diff options
| author | Mateusz Guzik <mguzik@redhat.com> | 2014-01-27 17:07:11 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-27 21:02:40 -0800 |
| commit | e7ca2552369c1dfe0216c626baf82c3d83ec36bb (patch) | |
| tree | dfaa96f46b9c9cf907c41bc6c825d250a8595010 /ipc/compat.c | |
| parent | ffa571dafbaec0c74e374ce0ea7b4212b6cbc94c (diff) | |
| download | lwn-e7ca2552369c1dfe0216c626baf82c3d83ec36bb.tar.gz lwn-e7ca2552369c1dfe0216c626baf82c3d83ec36bb.zip | |
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: Mateusz Guzik <mguzik@redhat.com>
Reported-by: Gabriellla 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/compat.c')
| -rw-r--r-- | ipc/compat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ipc/compat.c b/ipc/compat.c index f71e962756d8..f486b0096a67 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: |