tree 00a16a9440fb1d522160a404c97ed327f77a92a1
parent 2edeaa34a6e3f2c43b667f6c4f7b27944b811695
author Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> 1297085776 +0000
committer Linus Torvalds <torvalds@linux-foundation.org> 1297116240 -0800

CRED: Fix memory and refcount leaks upon security_prepare_creds() failure

In prepare_kernel_cred() since 2.6.29, put_cred(new) is called without
assigning new->usage when security_prepare_creds() returned an error.  As a
result, memory for new and refcount for new->{user,group_info,tgcred} are
leaked because put_cred(new) won't call __put_cred() unless old->usage == 1.

Fix these leaks by assigning new->usage (and new->subscribers which was added
in 2.6.32) before calling security_prepare_creds().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>