diff options
| author | Andreas Schwab <schwab@linux-m68k.org> | 2013-08-09 15:14:08 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-09-10 01:57:24 +0100 |
| commit | 595886031f65c6940b4f74703c041275cd833655 (patch) | |
| tree | f7c49e90817f06655af90e05c55a2132a55b8d33 | |
| parent | 52bd8a0804eda6fde7f25ab24caf8dcb6d40da9e (diff) | |
m68k: Truncate base in do_div()
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
| -rw-r--r-- | arch/m68k/include/asm/div64.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/m68k/include/asm/div64.h b/arch/m68k/include/asm/div64.h index edb66148a71d..755803299a0f 100644 --- a/arch/m68k/include/asm/div64.h +++ b/arch/m68k/include/asm/div64.h @@ -13,16 +13,17 @@ 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; \ }) |