linux-kernel - [PATCH v4 2/6] accel/ivpu: Use effective buffer size for zero terminator

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Message-Id: <20250508130612.82270-3-markus.burri@mt.com>
Date: Thu,  8 May 2025 15:06:08 +0200
From: Markus Burri <markus.burri@...com>
To: linux-kernel@...r.kernel.org
Cc: Markus Burri <markus.burri@...com>,
	Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
	"Oliver O'Halloran" <oohall@...il.com>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
	Maciej Falkowski <maciej.falkowski@...ux.intel.com>,
	Oded Gabbay <ogabbay@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Nuno Sa <nuno.sa@...log.com>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linuxppc-dev@...ts.ozlabs.org,
	dri-devel@...ts.freedesktop.org,
	linux-gpio@...r.kernel.org,
	linux-iio@...r.kernel.org,
	Markus Burri <markus.burri@....ch>
Subject: [PATCH v4 2/6] accel/ivpu: Use effective buffer size for zero terminator

Use the effective written size instead of original size as index for zero
termination. If the input from user-space is to larger and the input is
truncated, the original size is out-of-bound.
Since there is an upfront size check here, the change is for consistency.

Signed-off-by: Markus Burri <markus.burri@...com>
---
 drivers/accel/ivpu/ivpu_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/accel/ivpu/ivpu_debugfs.c b/drivers/accel/ivpu/ivpu_debugfs.c
index f0dad0c9ce33..cd24ccd20ba6 100644
--- a/drivers/accel/ivpu/ivpu_debugfs.c
+++ b/drivers/accel/ivpu/ivpu_debugfs.c
@@ -455,7 +455,7 @@ priority_bands_fops_write(struct file *file, const char __user *user_buf, size_t
 	if (ret < 0)
 		return ret;
 
-	buf[size] = '\0';
+	buf[ret] = '\0';
 	ret = sscanf(buf, "%u %u %u %u", &band, &grace_period, &process_grace_period,
 		     &process_quantum);
 	if (ret != 4)
-- 
2.39.5