umtx: handle allocation failire in umtx_pi_alloc()

Don't assume that this allocation will succeed. We may have been passed
M_NOWAIT.

The calling code already handles allocation failures, but the function
itself did not.

PR:		283807
MFC after:	1 week

This commit is contained in:

Kristof Provost

2025-01-05 17:09:08 +01:00

parent 93411b39ff

commit 50c1e179b5

1 changed files with 3 additions and 0 deletions

									
										sys/kern/kern_umtx.c
									
		+3
		
												View File
												
					@@ -1740,6 +1740,9 @@ umtx_pi_alloc(int flags)

						struct umtx_pi *pi;

						struct umtx_pi *pi;

						pi = uma_zalloc(umtx_pi_zone, M_ZERO | flags);

						pi = uma_zalloc(umtx_pi_zone, M_ZERO | flags);

						if (pi == NULL)

							return (NULL);

						TAILQ_INIT(&pi->pi_blocked);

						TAILQ_INIT(&pi->pi_blocked);

						atomic_add_int(&umtx_pi_allocated, 1);

						atomic_add_int(&umtx_pi_allocated, 1);

						return (pi);

						return (pi);