From: <gregkh@linuxfoundation.org>
To: jack@suse.cz, alexander.levin@verizon.com,
dan.j.williams@intel.com, gregkh@linuxfoundation.org
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "mm: Handle 0 flags in _calc_vm_trans() macro" has been added to the 4.14-stable tree
Date: Mon, 18 Dec 2017 13:57:10 +0100 [thread overview]
Message-ID: <151360183067102@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
mm: Handle 0 flags in _calc_vm_trans() macro
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-handle-0-flags-in-_calc_vm_trans-macro.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Jan Kara <jack@suse.cz>
Date: Fri, 3 Nov 2017 12:21:21 +0100
Subject: mm: Handle 0 flags in _calc_vm_trans() macro
From: Jan Kara <jack@suse.cz>
[ Upstream commit 592e254502041f953e84d091eae2c68cba04c10b ]
_calc_vm_trans() does not handle the situation when some of the passed
flags are 0 (which can happen if these VM flags do not make sense for
the architecture). Improve the _calc_vm_trans() macro to return 0 in
such situation. Since all passed flags are constant, this does not add
any runtime overhead.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/mman.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -64,8 +64,9 @@ static inline bool arch_validate_prot(un
* ("bit1" and "bit2" must be single bits)
*/
#define _calc_vm_trans(x, bit1, bit2) \
+ ((!(bit1) || !(bit2)) ? 0 : \
((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
- : ((x) & (bit1)) / ((bit1) / (bit2)))
+ : ((x) & (bit1)) / ((bit1) / (bit2))))
/*
* Combine the mmap "prot" argument into "vm_flags" used internally.
Patches currently in stable-queue which might be from jack@suse.cz are
queue-4.14/mm-handle-0-flags-in-_calc_vm_trans-macro.patch
queue-4.14/udf-avoid-overflow-when-session-starts-at-large-offset.patch
reply other threads:[~2017-12-18 12:58 UTC|newest]
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