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authorYinghai Lu <yinghai@kernel.org>2010-10-04 14:57:39 -0700
committerH. Peter Anvin <hpa@zytor.com>2010-10-05 21:45:35 -0700
commitf1af98c7629a1b76fd7336decbc776acdeed2120 (patch)
tree4886c7d9469f147a5c3d0ece2c3aa5993ae77ae3 /mm
parent1d931264af0f10649b35afa8fbd2e169da51ac08 (diff)
memblock: Fix wraparound in find_region()
When trying to find huge range for crashkernel, get [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at arch/x86/mm/memblock.c:248 memblock_x86_reserve_range+0x40/0x7a() [ 0.000000] Hardware name: Sun Fire x4800 [ 0.000000] memblock_x86_reserve_range: wrong range [0xffffffff37000000, 0x137000000) [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.36-rc5-tip-yh-01876-g1cac214-dirty #59 [ 0.000000] Call Trace: [ 0.000000] [<ffffffff82816f7e>] ? memblock_x86_reserve_range+0x40/0x7a [ 0.000000] [<ffffffff81078c2d>] warn_slowpath_common+0x85/0x9e [ 0.000000] [<ffffffff81078d38>] warn_slowpath_fmt+0x6e/0x70 [ 0.000000] [<ffffffff8281e77c>] ? memblock_find_region+0x40/0x78 [ 0.000000] [<ffffffff8281eb1f>] ? memblock_find_base+0x9a/0xb9 [ 0.000000] [<ffffffff82816f7e>] memblock_x86_reserve_range+0x40/0x7a [ 0.000000] [<ffffffff8280452c>] setup_arch+0x99d/0xb2a [ 0.000000] [<ffffffff810a3e02>] ? trace_hardirqs_off+0xd/0xf [ 0.000000] [<ffffffff81cec7d8>] ? _raw_spin_unlock_irqrestore+0x3d/0x4c [ 0.000000] [<ffffffff827ffcec>] start_kernel+0xde/0x3f1 [ 0.000000] [<ffffffff827ff2d4>] x86_64_start_reservations+0xa0/0xa4 [ 0.000000] [<ffffffff827ff3de>] x86_64_start_kernel+0x106/0x10d [ 0.000000] ---[ end trace a7919e7f17c0a725 ]--- [ 0.000000] Reserving 8192MB of memory at 17592186041200MB for crashkernel (System RAM: 526336MB) This is caused by a wraparound in the test due to size > end; explicitly check for this condition and fail. Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <4CAA4DD3.1080401@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/memblock.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index d5d63ac1fd83..9ad39690a2bd 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -105,13 +105,18 @@ static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t en
phys_addr_t base, res_base;
long j;
+ /* In case, huge size is requested */
+ if (end < size)
+ return MEMBLOCK_ERROR;
+
+ base = memblock_align_down((end - size), align);
+
/* Prevent allocations returning 0 as it's also used to
* indicate an allocation failure
*/
if (start == 0)
start = PAGE_SIZE;
- base = memblock_align_down((end - size), align);
while (start <= base) {
j = memblock_overlaps_region(&memblock.reserved, base, size);
if (j < 0)