[merged] mm-fix-overflow-check-in-expand_upwards.patch removed from -mm tree

[merged] mm-fix-overflow-check-in-expand_upwards.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm: fix overflow check in expand_upwards()
has been removed from the -mm tree.  Its filename was
     mm-fix-overflow-check-in-expand_upwards.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Helge Deller <deller@gmx.de>
Subject: mm: fix overflow check in expand_upwards()

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>
---

 mm/mmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/mmap.c~mm-fix-overflow-check-in-expand_upwards mm/mmap.c
--- a/mm/mmap.c~mm-fix-overflow-check-in-expand_upwards
+++ a/mm/mmap.c
@@ -2231,7 +2231,7 @@ int expand_upwards(struct vm_area_struct
 
 	/* Guard against exceeding limits of the address space. */
 	address &= PAGE_MASK;
-	if (address >= TASK_SIZE)
+	if (address >= (TASK_SIZE & PAGE_MASK))
 		return -ENOMEM;
 	address += PAGE_SIZE;
 
_

Patches currently in -mm which might be from deller@gmx.de are