tree 6d6c8b14231b487e476e0aa84775173be45ff455
parent 09c6eb1f651dad601f02435bbd79734954960c42
author Manfred Spraul <manfred@colorfullife.com> 1402090661 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1402096094 -0700

ipc/shm.c: check for integer overflow during shmget.

SHMMAX is the upper limit for the size of a shared memory segment, counted
in bytes.  The actual allocation is that size, rounded up to the next full
page.

Add a check that prevents the creation of segments where the rounded up
size causes an integer overflow.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>