CVS commit: src/sys/arch/x86/x86

["Andrew Doran" <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Tue Mar 17 22:37:05 UTC 2020

Modified Files:
        src/sys/arch/x86/x86: pmap.c

Log Message:
- pmap_enter(): under low memory conditions, if PTP allocation succeeded and
  then PV entry allocation failed, PTP pages were being freed without their
  struct pmap_page being reset back to the non-PTP setup, which then caused
  havoc with pmap_page_removed().  Fix it.

- pmap_enter_pv(): don't do the PV check if memory allocation failed.

Reported-by: syzbot+d9b42238107c155ca0cd%syzkaller.appspotmail.com@localhost
Reported-by: syzbot+80cf4850dc1cf29901dc%syzkaller.appspotmail.com@localhost


To generate a diff of this commit:
cvs rdiff -u -r1.374 -r1.375 src/sys/arch/x86/x86/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.