linux/ipc
Davidlohr Bueso 5f2a2d5d42 ipc,msg: drop dst nil validation in copy_msg
d0edd85283 ("ipc: convert invalid scenarios to use WARN_ON") relaxed the
nil dst parameter check, originally being a full BUG_ON.  However, this
check seems quite unnecessary when the only purpose is for
ceckpoint/restore (MSG_COPY flag):

o The copy variable is set initially to nil, apparently as a way of
  ensuring that prepare_copy is previously called.  Which is in fact done,
  unconditionally at the beginning of do_msgrcv.

o There is no concurrency with 'copy' (stack allocated in do_msgrcv).

Furthermore, any errors in 'copy' (and thus prepare_copy/copy_msg) should
always handled by IS_ERR() family.  Therefore remove this check altogether
as it can never occur with the current users.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-11-06 17:50:42 -08:00
..
compat_mq.c
compat.c
ipc_sysctl.c
Makefile
mq_sysctl.c
mqueue.c
msg.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-09-30 12:48:40 -04:00
msgutil.c ipc,msg: drop dst nil validation in copy_msg 2015-11-06 17:50:42 -08:00
namespace.c
sem.c
shm.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-09-30 12:48:40 -04:00
syscall.c
util.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-09-30 12:48:40 -04:00
util.h