From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Frank Haverkamp <haver@linux.vnet.ibm.com>
Cc: "Guilherme G . Piccoli" <gpiccoli@linux.vnet.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Christian Borntraeger <borntraeger@de.ibm.com>
Subject: [PATCH] genwqe: Fix size check
Date: Wed, 12 Dec 2018 14:45:18 +0100 [thread overview]
Message-ID: <20181212134518.4587-1-borntraeger@de.ibm.com> (raw)
Calling the test program genwqe_cksum with the default buffer size of
2MB triggers the following kernel warning on s390:
WARNING: CPU: 30 PID: 9311 at mm/page_alloc.c:3189 __alloc_pages_nodemask+0x45c/0xbe0
CPU: 30 PID: 9311 Comm: genwqe_cksum Kdump: loaded Not tainted 3.10.0-957.el7.s390x #1
task: 00000005e5d13980 ti: 00000005e7c6c000 task.ti: 00000005e7c6c000
Krnl PSW : 0704c00180000000 00000000002780ac (__alloc_pages_nodemask+0x45c/0xbe0)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3
Krnl GPRS: 00000000002932b8 0000000000b73d7c 0000000000000010 0000000000000009
0000000000000041 00000005e7c6f9b8 0000000000000001 00000000000080d0
0000000000000000 0000000000b70500 0000000000000001 0000000000000000
0000000000b70528 00000000007682c0 0000000000277df2 00000005e7c6f9a0
Krnl Code: 000000000027809e: de7195001000 ed 1280(114,%r9),0(%r1)
00000000002780a4: a774fead brc 7,277dfe
#00000000002780a8: a7f40001 brc 15,2780aa
>00000000002780ac: 92011000 mvi 0(%r1),1
00000000002780b0: a7f4fea7 brc 15,277dfe
00000000002780b4: 9101c6b6 tm 1718(%r12),1
00000000002780b8: a784ff3a brc 8,277f2c
00000000002780bc: a7f4fe2e brc 15,277d18
Call Trace:
([<0000000000277df2>] __alloc_pages_nodemask+0x1a2/0xbe0)
[<000000000013afae>] s390_dma_alloc+0xfe/0x310
[<000003ff8065f362>] __genwqe_alloc_consistent+0xfa/0x148 [genwqe_card]
[<000003ff80658f7a>] genwqe_mmap+0xca/0x248 [genwqe_card]
[<00000000002b2712>] mmap_region+0x4e2/0x778
[<00000000002b2c54>] do_mmap+0x2ac/0x3e0
[<0000000000292d7e>] vm_mmap_pgoff+0xd6/0x118
[<00000000002b081c>] SyS_mmap_pgoff+0xdc/0x268
[<00000000002b0a34>] SyS_old_mmap+0x8c/0xb0
[<000000000074e518>] sysc_tracego+0x14/0x1e
[<000003ffacf87dc6>] 0x3ffacf87dc6
turns out the check in __genwqe_alloc_consistent uses "> MAX_ORDER"
while the mm code uses ">= MAX_ORDER". Fix genwqe.
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
drivers/misc/genwqe/card_utils.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c
index 3fcb9a2fe1c9..efe2fb72d54b 100644
--- a/drivers/misc/genwqe/card_utils.c
+++ b/drivers/misc/genwqe/card_utils.c
@@ -215,7 +215,7 @@ u32 genwqe_crc32(u8 *buff, size_t len, u32 init)
void *__genwqe_alloc_consistent(struct genwqe_dev *cd, size_t size,
dma_addr_t *dma_handle)
{
- if (get_order(size) > MAX_ORDER)
+ if (get_order(size) >= MAX_ORDER)
return NULL;
return dma_zalloc_coherent(&cd->pci_dev->dev, size, dma_handle,
--
2.19.1
next reply other threads:[~2018-12-12 13:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 13:45 Christian Borntraeger [this message]
2018-12-12 14:18 ` haver
2018-12-12 14:36 ` Christian Borntraeger
2018-12-19 9:10 ` Greg Kroah-Hartman
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