From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
linux-nvme@lists.infradead.org,
Bart Van Assche <bvanassche@acm.org>,
Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH AUTOSEL 4.19 056/237] nvmet: avoid integer overflow in the discard code
Date: Sat, 16 Nov 2019 10:38:11 -0500 [thread overview]
Message-ID: <20191116154113.7417-56-sashal@kernel.org> (raw)
In-Reply-To: <20191116154113.7417-1-sashal@kernel.org>
From: Bart Van Assche <bvanassche@acm.org>
[ Upstream commit 8eacd1bd21d6913ec27e6120e9a8733352e191d3 ]
Although I'm not sure whether it is a good idea to support large discard
commands, I think integer overflow for discard ranges larger than 4 GB
should be avoided. This patch avoids that smatch reports the following:
drivers/nvme/target/io-cmd-file.c:249:1 nvmet_file_execute_discard() warn: should '((range.nlb)) << req->ns->blksize_shift' be a 64 bit type?
Fixes: d5eff33ee6f8 ("nvmet: add simple file backed ns support")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/target/io-cmd-file.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 81a9dc5290a87..39d972e2595f0 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -246,7 +246,8 @@ static void nvmet_file_execute_discard(struct nvmet_req *req)
break;
offset = le64_to_cpu(range.slba) << req->ns->blksize_shift;
- len = le32_to_cpu(range.nlb) << req->ns->blksize_shift;
+ len = le32_to_cpu(range.nlb);
+ len <<= req->ns->blksize_shift;
if (offset + len > req->ns->size) {
ret = NVME_SC_LBA_RANGE | NVME_SC_DNR;
break;
--
2.20.1
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next parent reply other threads:[~2019-11-16 15:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191116154113.7417-1-sashal@kernel.org>
2019-11-16 15:38 ` Sasha Levin [this message]
2019-11-16 15:38 ` [PATCH AUTOSEL 4.19 057/237] nvmet-fcloop: suppress a compiler warning Sasha Levin
2019-11-16 15:38 ` [PATCH AUTOSEL 4.19 058/237] nvme-pci: fix hot removal during error handling Sasha Levin
2019-11-16 15:40 ` [PATCH AUTOSEL 4.19 175/237] nvme-pci: fix conflicting p2p resource adds Sasha Levin
2019-11-16 15:41 ` [PATCH AUTOSEL 4.19 232/237] nvme-pci: fix surprise removal Sasha Levin
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