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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-02-06 08:17:19 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-06 08:43:11 -0800 |
| commit | 04ec93fe9bc98e3bd8560f79f56fed66dfae40d5 (patch) | |
| tree | ba7d1ca513641167f61d8d8bb56b832f63d98bca /kernel/fork.c | |
| parent | b2a740aab8f3bc2fd9f01528e39607bd9a1f0da6 (diff) | |
| download | lwn-04ec93fe9bc98e3bd8560f79f56fed66dfae40d5.tar.gz lwn-04ec93fe9bc98e3bd8560f79f56fed66dfae40d5.zip | |
fork.c: fix NULL pointer dereference when nr_threads == threads-max
I happened to forked lots of processes, and hit NULL pointer dereference.
It is because in copy_process() after checking max_threads, 0 is returned
but not -EAGAIN.
The bug is introduced by "CRED: Detach the credentials from task_struct"
(commit f1752eec6145c97163dbce62d17cf5d928e28a27).
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 242a706e7721..6d5dbb7a13e2 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1005,6 +1005,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, * triggers too late. This doesn't hurt, the check is only there * to stop root fork bombs. */ + retval = -EAGAIN; if (nr_threads >= max_threads) goto bad_fork_cleanup_count; |