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From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Cc: Bruce Richardson <bruce.richardson@intel.com>
Subject: [dpdk-dev] [PATCH v2] raw/ioat: fix queue index calculation
Date: Thu,  5 Nov 2020 10:41:04 +0000
Message-ID: <20201105104104.219599-1-bruce.richardson@intel.com> (raw)
In-Reply-To: <20201103144858.1317742-1-bruce.richardson@intel.com>

Coverity flags a possible problem where the 8-bit wq_idx value may have
errors when shifted and sign-extended to pointer size. Since this can
only occur if the shift index is larger than any expected value from
hardware, it's unlikely to cause any real problems, but we can eliminate
any possible errors, and the coverity issue, by explicitly typecasting
the uint8_t value to uintptr_t before any shift operations occur.

Coverity issue: 363695
Fixes: a33969462135 ("raw/ioat: fix work-queue config size")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

---
V2: Change uint64_t cast to uintptr_t to prevent 32-bit build issues
---
 drivers/raw/ioat/idxd_pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/raw/ioat/idxd_pci.c b/drivers/raw/ioat/idxd_pci.c
index 99ecfbbb4..01623f33f 100644
--- a/drivers/raw/ioat/idxd_pci.c
+++ b/drivers/raw/ioat/idxd_pci.c
@@ -47,7 +47,8 @@ idxd_pci_dev_command(struct idxd_rawdev *idxd, enum rte_idxd_cmds command)
 static uint32_t *
 idxd_get_wq_cfg(struct idxd_pci_common *pci, uint8_t wq_idx)
 {
-	return RTE_PTR_ADD(pci->wq_regs_base, wq_idx << (5 + pci->wq_cfg_sz));
+	return RTE_PTR_ADD(pci->wq_regs_base,
+			(uintptr_t)wq_idx << (5 + pci->wq_cfg_sz));
 }
 
 static int
-- 
2.25.1


  parent reply	other threads:[~2020-11-05 10:41 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-03 14:48 [dpdk-dev] [PATCH] " Bruce Richardson
2020-11-03 20:21 ` Thomas Monjalon
2020-11-03 21:51   ` Thomas Monjalon
2020-11-04  9:43     ` Bruce Richardson
2020-11-05 10:41 ` Bruce Richardson [this message]
2020-11-13 14:32   ` [dpdk-dev] [PATCH v2] " Thomas Monjalon

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