| commit | 8ab867cb0806a8e195de161fd8883a0578d1d050 | [log] [tgz] |
|---|---|---|
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | Thu Aug 31 13:18:22 2017 +0200 |
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | Thu Aug 31 14:03:21 2017 +0200 |
| tree | 1181aefbc32ee92ad98c96f457581311f3229a3f | |
| parent | 0b89ede629637c03b9a728fb08bfe6ed51de9be7 [diff] |
s390/mm: fix BUG_ON in crst_table_upgrade
A 31-bit compat process can force a BUG_ON in crst_table_upgrade
with specific, invalid mmap calls, e.g.
mmap((void*) 0x7fff8000, 0x10000, 3, 32, -1, 0)
The arch_get_unmapped_area[_topdown] functions miss an if condition
in the decision to do a page table upgrade.
Fixes: 9b11c7912d00 ("s390/mm: simplify arch_get_unmapped_area[_topdown]")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>