diff options
| author | Helge Deller <deller@gmx.de> | 2017-07-14 14:49:38 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-11-06 15:33:05 +0100 |
| commit | afa0ca4ba41d09a2d56819a9fd946c4e73aaffe0 (patch) | |
| tree | 153a7ebec3ccf0e93bcef3837d712c14cb952d55 /drivers/crypto | |
| parent | 993150b4d8f925835eac813aeff6985da156f23b (diff) | |
mm: fix overflow check in expand_upwards()
commit 37511fb5c91db93d8bd6e3f52f86e5a7ff7cfcdf upstream.
Jörn Engel noticed that the expand_upwards() function might not return
-ENOMEM in case the requested address is (unsigned long)-PAGE_SIZE and
if the architecture didn't defined TASK_SIZE as multiple of PAGE_SIZE.
Affected architectures are arm, frv, m68k, blackfin, h8300 and xtensa
which all define TASK_SIZE as 0xffffffff, but since none of those have
an upwards-growing stack we currently have no actual issue.
Nevertheless let's fix this just in case any of the architectures with
an upward-growing stack (currently parisc, metag and partly ia64) define
TASK_SIZE similar.
Link: http://lkml.kernel.org/r/20170702192452.GA11868@p100.box
Fixes: bd726c90b6b8 ("Allow stack to grow up to address space limit")
Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: Jörn Engel <joern@purestorage.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'drivers/crypto')
0 files changed, 0 insertions, 0 deletions