linux-kernel - [PATCH] iommu/tegra241-cmdqv: Fix -Wformat-truncation warnings in lvcmdq_error

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Message-ID: <20240902055745.629456-1-nicolinc@nvidia.com>
Date: Sun, 1 Sep 2024 22:57:45 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>
CC: <thierry.reding@...il.com>, <vdumpa@...dia.com>, <robin.murphy@....com>,
	<joro@...tes.org>, <jonathanh@...dia.com>, <jgg@...dia.com>,
	<linux-tegra@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] iommu/tegra241-cmdqv: Fix -Wformat-truncation warnings in lvcmdq_error_header

Kernel test robot reported a few trucation warnings at the snprintf:
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c:
	In function ‘tegra241_vintf_free_lvcmdq’:
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c:239:56:
	warning: ‘%u’ directive output may be truncated writing between 1 and
	5 bytes into a region of size between 3 and 11 [-Wformat-truncation=]
  239 |         snprintf(header, hlen, "VINTF%u: VCMDQ%u/LVCMDQ%u: ",
      |                                                        ^~
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c:239:32: note: directive argument
	in the range [0, 65535]
  239 |         snprintf(header, hlen, "VINTF%u: VCMDQ%u/LVCMDQ%u: ",
      |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c:239:9: note: ‘snprintf’ output
	between 25 and 37 bytes into a destination of size 32
  239 |         snprintf(header, hlen, "VINTF%u: VCMDQ%u/LVCMDQ%u: ",
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  240 |                  vcmdq->vintf->idx, vcmdq->idx, vcmdq->lidx);

Fix by bumping up the size of the header to hold more characters.

Fixes: 918eb5c856f6 ("iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409020406.7ed5uojF-lkp@intel.com/
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
index 9eb9d959f3e5..03fd13c21dcc 100644
--- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
+++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
@@ -233,7 +233,7 @@ static inline int vintf_write_config(struct tegra241_vintf *vintf, u32 regval)
 static inline char *lvcmdq_error_header(struct tegra241_vcmdq *vcmdq,
 					char *header, int hlen)
 {
-	WARN_ON(hlen < 32);
+	WARN_ON(hlen < 64);
 	if (WARN_ON(!vcmdq->vintf))
 		return "";
 	snprintf(header, hlen, "VINTF%u: VCMDQ%u/LVCMDQ%u: ",
@@ -243,7 +243,7 @@ static inline char *lvcmdq_error_header(struct tegra241_vcmdq *vcmdq,
 
 static inline int vcmdq_write_config(struct tegra241_vcmdq *vcmdq, u32 regval)
 {
-	char header[32], *h = lvcmdq_error_header(vcmdq, header, 32);
+	char header[64], *h = lvcmdq_error_header(vcmdq, header, 64);
 
 	return tegra241_cmdqv_write_config(vcmdq->cmdqv,
 					   REG_VCMDQ_PAGE0(vcmdq, CONFIG),
@@ -354,7 +354,7 @@ tegra241_cmdqv_get_cmdq(struct arm_smmu_device *smmu,
 
 static void tegra241_vcmdq_hw_deinit(struct tegra241_vcmdq *vcmdq)
 {
-	char header[32], *h = lvcmdq_error_header(vcmdq, header, 32);
+	char header[64], *h = lvcmdq_error_header(vcmdq, header, 64);
 	u32 gerrorn, gerror;
 
 	if (vcmdq_write_config(vcmdq, 0)) {
@@ -382,7 +382,7 @@ static void tegra241_vcmdq_hw_deinit(struct tegra241_vcmdq *vcmdq)
 
 static int tegra241_vcmdq_hw_init(struct tegra241_vcmdq *vcmdq)
 {
-	char header[32], *h = lvcmdq_error_header(vcmdq, header, 32);
+	char header[64], *h = lvcmdq_error_header(vcmdq, header, 64);
 	int ret;
 
 	/* Reset VCMDQ */
@@ -555,13 +555,13 @@ static int tegra241_vintf_init_lvcmdq(struct tegra241_vintf *vintf, u16 lidx,
 static void tegra241_vintf_free_lvcmdq(struct tegra241_vintf *vintf, u16 lidx)
 {
 	struct tegra241_vcmdq *vcmdq = vintf->lvcmdqs[lidx];
-	char header[32];
+	char header[64];
 
 	tegra241_vcmdq_free_smmu_cmdq(vcmdq);
 	tegra241_vintf_deinit_lvcmdq(vintf, lidx);
 
 	dev_dbg(vintf->cmdqv->dev,
-		"%sdeallocated\n", lvcmdq_error_header(vcmdq, header, 32));
+		"%sdeallocated\n", lvcmdq_error_header(vcmdq, header, 64));
 	kfree(vcmdq);
 }
 
@@ -570,7 +570,7 @@ tegra241_vintf_alloc_lvcmdq(struct tegra241_vintf *vintf, u16 lidx)
 {
 	struct tegra241_cmdqv *cmdqv = vintf->cmdqv;
 	struct tegra241_vcmdq *vcmdq;
-	char header[32];
+	char header[64];
 	int ret;
 
 	vcmdq = kzalloc(sizeof(*vcmdq), GFP_KERNEL);
@@ -587,7 +587,7 @@ tegra241_vintf_alloc_lvcmdq(struct tegra241_vintf *vintf, u16 lidx)
 		goto deinit_lvcmdq;
 
 	dev_dbg(cmdqv->dev,
-		"%sallocated\n", lvcmdq_error_header(vcmdq, header, 32));
+		"%sallocated\n", lvcmdq_error_header(vcmdq, header, 64));
 	return vcmdq;
 
 deinit_lvcmdq:
-- 
2.43.0