git: 774549fe06ac - main - riscv pmap: Release PTP reference on leaf ptpage allocation failure
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Date: Sun, 16 Jun 2024 16:20:10 UTC
The branch main has been updated by bnovkov: URL: https://cgit.FreeBSD.org/src/commit/?id=774549fe06ac0f45a5a5a661a7fb4107a8695d4c commit 774549fe06ac0f45a5a5a661a7fb4107a8695d4c Author: Bojan Novković <bnovkov@FreeBSD.org> AuthorDate: 2024-06-13 16:14:21 +0000 Commit: Bojan Novković <bnovkov@FreeBSD.org> CommitDate: 2024-06-16 16:19:27 +0000 riscv pmap: Release PTP reference on leaf ptpage allocation failure d0941ed fixed an edge case invloving mlock() and superpage creation by creating and inserting a leaf pagetable page for mlock'd superpages. However, the code does not properly release the reference to the pagetable page in the error handling path. This commit fixes the issue by adding calls to 'pmap_abort_ptp' in the error handling path. Reported by: alc Approved by: markj (mentor) Fixes: d0941ed Differential Revision: https://reviews.freebsd.org/D45580 --- sys/riscv/riscv/pmap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c index 4f6305ed651d..1e4061935ca0 100644 --- a/sys/riscv/riscv/pmap.c +++ b/sys/riscv/riscv/pmap.c @@ -3291,12 +3291,14 @@ pmap_enter_l2(pmap_t pmap, vm_offset_t va, pd_entry_t new_l2, u_int flags, if ((new_l2 & PTE_SW_WIRED) != 0 && pmap != kernel_pmap) { uwptpg = vm_page_alloc_noobj(VM_ALLOC_WIRED); if (uwptpg == NULL) { + pmap_abort_ptp(pmap, va, l2pg); return (KERN_RESOURCE_SHORTAGE); } uwptpg->pindex = pmap_l2_pindex(va); if (pmap_insert_pt_page(pmap, uwptpg, true, false)) { vm_page_unwire_noq(uwptpg); vm_page_free(uwptpg); + pmap_abort_ptp(pmap, va, l2pg); return (KERN_RESOURCE_SHORTAGE); } pmap_resident_count_inc(pmap, 1);