From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org
Subject: [ 32/34] m68k: Truncate base in do_div()
Date: Sun, 18 Aug 2013 13:34:45 -0700 [thread overview]
Message-ID: <20130818203301.876970249@linuxfoundation.org> (raw)
In-Reply-To: <20130818203259.653403173@linuxfoundation.org>
3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andreas Schwab <schwab@linux-m68k.org>
commit ea077b1b96e073eac5c3c5590529e964767fc5f7 upstream.
Explicitly truncate the second operand of do_div() to 32 bits to guard
against bogus code calling it with a 64-bit divisor.
[Thorsten]
After upgrading from 3.2 to 3.10, mounting a btrfs volume fails with:
btrfs: setting nodatacow, compression disabled
btrfs: enabling auto recovery
btrfs: disk space caching is enabled
---
arch/m68k/include/asm/div64.h | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/arch/m68k/include/asm/div64.h
+++ b/arch/m68k/include/asm/div64.h
@@ -15,16 +15,17 @@
unsigned long long n64; \
} __n; \
unsigned long __rem, __upper; \
+ unsigned long __base = (base); \
\
__n.n64 = (n); \
if ((__upper = __n.n32[0])) { \
asm ("divul.l %2,%1:%0" \
- : "=d" (__n.n32[0]), "=d" (__upper) \
- : "d" (base), "0" (__n.n32[0])); \
+ : "=d" (__n.n32[0]), "=d" (__upper) \
+ : "d" (__base), "0" (__n.n32[0])); \
} \
asm ("divu.l %2,%1:%0" \
- : "=d" (__n.n32[1]), "=d" (__rem) \
- : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
+ : "=d" (__n.n32[1]), "=d" (__rem) \
+ : "d" (__base), "1" (__upper), "0" (__n.n32[1])); \
(n) = __n.n64; \
__rem; \
})
next prev parent reply other threads:[~2013-08-18 20:48 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-18 20:34 [ 00/34] 3.4.59-stable review Greg Kroah-Hartman
2013-08-18 20:34 ` [ 01/34] perf/arm: Fix armpmu_map_hw_event() Greg Kroah-Hartman
2013-08-18 20:34 ` [ 02/34] fs/proc/task_mmu.c: fix buffer overflow in add_page_map() Greg Kroah-Hartman
2013-08-18 20:34 ` [ 03/34] drm/i915/lvds: ditch ->prepare special case Greg Kroah-Hartman
2013-08-18 20:34 ` [ 04/34] MIPS: Expose missing pci_io{map,unmap} declarations Greg Kroah-Hartman
2013-08-18 20:34 ` [ 05/34] microblaze: Update microblaze defconfigs Greg Kroah-Hartman
2013-08-18 20:34 ` [ 06/34] sound: Fix make allmodconfig on MIPS Greg Kroah-Hartman
2013-08-18 20:34 ` [ 07/34] sound: Fix make allmodconfig on MIPS correctly Greg Kroah-Hartman
2013-08-18 20:34 ` [ 08/34] HID: microsoft: do not use compound literal - fix build Greg Kroah-Hartman
2013-08-18 20:34 ` [ 09/34] vm: add no-mmu vm_iomap_memory() stub Greg Kroah-Hartman
2013-08-18 20:34 ` [ 10/34] cris: posix_types.h, include asm-generic/posix_types.h Greg Kroah-Hartman
2013-08-18 20:34 ` [ 11/34] cris: Remove old legacy "-traditional" flag from arch-v10/lib/Makefile Greg Kroah-Hartman
2013-08-18 20:34 ` [ 12/34] CRIS: Add _sdata to vmlinux.lds.S Greg Kroah-Hartman
2013-08-18 20:34 ` [ 13/34] futex: Take hugepages into account when generating futex_key Greg Kroah-Hartman
2013-08-18 20:34 ` [ 14/34] frv: Use correct size for task_struct allocation Greg Kroah-Hartman
2013-08-18 20:34 ` [ 15/34] frv: Use core allocator for task_struct Greg Kroah-Hartman
2013-08-18 20:34 ` [ 16/34] powerpc/numa: Avoid stupid uninitialized warning from gcc Greg Kroah-Hartman
2013-08-18 20:34 ` [ 17/34] alpha: makefile: dont enforce small data model for kernel builds Greg Kroah-Hartman
2013-08-18 20:34 ` [ 18/34] md/raid1,raid10: use freeze_array in place of raise_barrier in various places Greg Kroah-Hartman
2013-08-18 20:34 ` [ 19/34] sparc32: add ucmpdi2 Greg Kroah-Hartman
2013-08-18 20:34 ` [ 20/34] sparc32: Add ucmpdi2.o to obj-y instead of lib-y Greg Kroah-Hartman
2013-08-18 20:34 ` [ 21/34] MIPS: Rewrite pfn_valid to work in modules, too Greg Kroah-Hartman
2013-08-18 20:34 ` [ 22/34] af_key: initialize satype in key_notify_policy_flush() Greg Kroah-Hartman
2013-08-18 20:34 ` [ 23/34] iwl4965: set power mode early Greg Kroah-Hartman
2013-08-18 20:34 ` [ 24/34] iwl4965: reset firmware after rfkill off Greg Kroah-Hartman
2013-08-18 20:34 ` [ 25/34] can: pcan_usb: fix wrong memcpy() bytes length Greg Kroah-Hartman
2013-08-18 20:34 ` [ 26/34] genetlink: fix family dump race Greg Kroah-Hartman
2013-08-18 20:34 ` [ 27/34] usb: add two quirky touchscreen Greg Kroah-Hartman
2013-08-18 20:34 ` [ 28/34] USB: mos7720: fix broken control requests Greg Kroah-Hartman
2013-08-18 20:34 ` [ 29/34] xtensa: fix linker script transformation for .text.unlikely Greg Kroah-Hartman
2013-08-18 20:34 ` [ 30/34] xtensa: replace xtensa-specific _f{data,text} by _s{data,text} Greg Kroah-Hartman
2013-08-18 20:34 ` [ 31/34] ARM: 7809/1: perf: fix event validation for software group leaders Greg Kroah-Hartman
2013-08-18 20:34 ` Greg Kroah-Hartman [this message]
2013-08-18 20:34 ` [ 33/34] m68k/atari: ARAnyM - Fix NatFeat module support Greg Kroah-Hartman
2013-08-18 20:34 ` [ 34/34] jbd2: Fix use after free after error in jbd2_journal_dirty_metadata() Greg Kroah-Hartman
2013-08-19 1:49 ` [ 00/34] 3.4.59-stable review Guenter Roeck
2013-08-19 18:02 ` Shuah Khan
2013-08-19 19:35 ` Greg Kroah-Hartman
2013-08-19 20:14 ` Stefan Lippers-Hollmann
2013-08-19 22:22 ` Shuah Khan
2013-08-19 22:30 ` Greg Kroah-Hartman
2013-08-20 7:36 ` Berg, Johannes
2013-08-20 15:24 ` Greg Kroah-Hartman
2013-08-20 15:32 ` Berg, Johannes
2013-08-20 15:53 ` Hugh Dickins
2013-08-20 16:03 ` Greg Kroah-Hartman
2013-08-20 16:25 ` Hugh Dickins
2013-08-20 16:43 ` Steven Rostedt
2013-08-20 16:43 ` Shuah Khan
2013-08-19 22:31 ` Shuah Khan
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