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Merge branch 'ucount-rlimit-fixes-for-v5.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

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Pull ucount rlimit fix from Eric Biederman.

Make sure the ucounts have a reference to the user namespace it refers
to, so that users that themselves don't carry such a reference around
can safely use the ucount functions.

* 'ucount-rlimit-fixes-for-v5.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  ucount:  Make get_ucount a safe get_user replacement
This commit is contained in:
Linus Torvalds 2022-01-28 19:25:24 +02:00
commit 76fcbc9c7c
1 changed files with 2 additions and 0 deletions
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kernel/ucount.c
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@ -190,6 +190,7 @@ struct ucounts *alloc_ucounts(struct user_namespace *ns, kuid_t uid)
kfree(new);
} else {
hlist_add_head(&new->node, hashent);
get_user_ns(new->ns);
spin_unlock_irq(&ucounts_lock);
return new;
}
@ -210,6 +211,7 @@ void put_ucounts(struct ucounts *ucounts)
if (atomic_dec_and_lock_irqsave(&ucounts->count, &ucounts_lock, flags)) {
hlist_del_init(&ucounts->node);
spin_unlock_irqrestore(&ucounts_lock, flags);
put_user_ns(ucounts->ns);
kfree(ucounts);
}
}