From: Yajun Deng <yajun.deng@linux.dev>
To: kurt.schwemmer@microsemi.com, logang@deltatee.com,
jdmason@kudzu.us, dave.jiang@intel.com, allenbh@gmail.com
Cc: linux-pci@vger.kernel.org, ntb@lists.linux.dev,
linux-kernel@vger.kernel.org, Yajun Deng <yajun.deng@linux.dev>
Subject: [PATCH] ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans
Date: Wed, 16 Aug 2023 16:33:05 +0800 [thread overview]
Message-ID: <20230816083305.1426718-1-yajun.deng@linux.dev> (raw)
There is a kernel API ntb_mw_clear_trans() would pass 0 to both addr and
size. This would make xlate_pos negative.
[ 23.734156] switchtec switchtec0: MW 0: part 0 addr 0x0000000000000000 size 0x0000000000000000
[ 23.734158] ================================================================================
[ 23.734172] UBSAN: shift-out-of-bounds in drivers/ntb/hw/mscc/ntb_hw_switchtec.c:293:7
[ 23.734418] shift exponent -1 is negative
Ensuring xlate_pos is a positive or zero before BIT.
Fixes: 1e2fd202f859 ("ntb_hw_switchtec: Check for alignment of the buffer in mw_set_trans()")
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
---
drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index d6bbcc7b5b90..21468d4fef64 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -288,7 +288,7 @@ static int switchtec_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
if (size != 0 && xlate_pos < 12)
return -EINVAL;
- if (!IS_ALIGNED(addr, BIT_ULL(xlate_pos))) {
+ if (xlate_pos >= 0 && !IS_ALIGNED(addr, BIT_ULL(xlate_pos))) {
/*
* In certain circumstances we can get a buffer that is
* not aligned to its size. (Most of the time
--
2.25.1
next reply other threads:[~2023-08-16 8:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-16 8:33 Yajun Deng [this message]
2023-08-16 20:41 ` [PATCH] ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans Logan Gunthorpe
2023-08-17 17:25 ` Bjorn Helgaas
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