The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=9658d9c71ae5eebb42cb86372ca75bb7ec0a0638
commit 9658d9c71ae5eebb42cb86372ca75bb7ec0a0638 Author: Konstantin Belousov <[email protected]> AuthorDate: 2021-01-05 15:36:37 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2021-01-11 20:57:52 +0000 amd64 pmap: fix NULL deref in pmap_mincore(). pmap_pdpe() might return NULL, check for it. Reviewed by: markj Reported and tested by: pho Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27956 --- sys/amd64/amd64/pmap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index 2ec303d687a7..f4bfceb6aaaa 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -9490,6 +9490,8 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *pap) pa = 0; val = 0; pdpe = pmap_pdpe(pmap, addr); + if (pdpe == NULL) + goto out; if ((*pdpe & PG_V) != 0) { if ((*pdpe & PG_PS) != 0) { pte = *pdpe; @@ -9525,6 +9527,7 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *pap) (pte & (PG_MANAGED | PG_V)) == (PG_MANAGED | PG_V)) { *pap = pa; } +out: PMAP_UNLOCK(pmap); return (val); } _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
