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authorEric W. Biederman <ebiederm@xmission.com>2021-10-16 13:50:48 -0500
committerEric W. Biederman <ebiederm@xmission.com>2021-10-20 10:45:34 -0500
commit5fc9e37cd5ae762b856912cdedb226a884b3c3e0 (patch)
tree9f988eb3120b1d61b23ae53a85a2b1955cc5d794 /kernel/ucount.c
parent99c31f9feda41d0f10d030dc04ba106c93295aa2 (diff)
downloadlinux-5fc9e37cd5ae762b856912cdedb226a884b3c3e0.tar.bz2
ucounts: Remove unnecessary test for NULL ucount in get_ucounts
All of the callers of get_ucounts are passeds a non-NULL value so stop handling a NULL ucounts pointer in get_ucounts. It is guaranteed that ever valid fully formed cred that is passed to commit_cred contains a non-NULL ucounts pointer. This in turn gurantees that current_ucounts() never returns NULL. The call of get_ucounts in user_shm_lock is always passed current_ucounts(). The call of get_ucounts in mqueue_get_inode is always passed current_ucounts(). The call of get_ucounts in inc_rlmit_get_ucounts is always passed iter, after iter has been verified to be non-NULL. The call of get_ucounts in key_change_session_keyring is always passed current_ucounts(). The call of get_ucounts in prepare_cred is always passed current_ucounts(). The call of get_ucounts in prepare_kernel_cred is always passed task->cred->ucounts or init_cred->ucounts which being on tasks are guaranteed to have a non-NULL ucounts field. Link: https://lkml.kernel.org/r/87v91uqksg.fsf_-_@disp2133 Tested-by: Yu Zhao <yuzhao@google.com> Reviewed-by: Alexey Gladkov <legion@kernel.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/ucount.c')
-rw-r--r--kernel/ucount.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/ucount.c b/kernel/ucount.c
index eb03f3c68375..708d05164a7d 100644
--- a/kernel/ucount.c
+++ b/kernel/ucount.c
@@ -152,7 +152,7 @@ static void hlist_add_ucounts(struct ucounts *ucounts)
struct ucounts *get_ucounts(struct ucounts *ucounts)
{
- if (ucounts && atomic_add_negative(1, &ucounts->count)) {
+ if (atomic_add_negative(1, &ucounts->count)) {
put_ucounts(ucounts);
ucounts = NULL;
}