linux-kernel - [PATCH 2/7] firmware: cs_dsp: Check for valid num_regs in cs_dsp_wseq_multi

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Message-ID: <20250131195639.1784933-3-ftreven@opensource.cirrus.com>
Date: Fri, 31 Jan 2025 13:56:33 -0600
From: Fred Treven <ftreven@...nsource.cirrus.com>
To: Simon Trimmer <simont@...nsource.cirrus.com>,
        Charles Keepax
	<ckeepax@...nsource.cirrus.com>,
        Richard Fitzgerald
	<rf@...nsource.cirrus.com>
CC: Fred Treven <ftreven@...nsource.cirrus.com>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/7] firmware: cs_dsp: Check for valid num_regs in cs_dsp_wseq_multi_write()

If a value of 0 or below is passed into cs_dsp_wseq_multi_write()
the function will never enter its for loop.

Verify that num_regs passed into the function is valid
and throw a user-visible error if not.

Signed-off-by: Fred Treven <ftreven@...nsource.cirrus.com>
---
 drivers/firmware/cirrus/cs_dsp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/firmware/cirrus/cs_dsp.c b/drivers/firmware/cirrus/cs_dsp.c
index 56315b0b5583..aacf6960d1ea 100644
--- a/drivers/firmware/cirrus/cs_dsp.c
+++ b/drivers/firmware/cirrus/cs_dsp.c
@@ -3743,6 +3743,11 @@ int cs_dsp_wseq_multi_write(struct cs_dsp *dsp, struct cs_dsp_wseq *wseq,
 {
 	int i, ret;
 
+	if (num_regs <= 0) {
+		cs_dsp_err(dsp, "Invalid number of regs: %d\n", num_regs);
+		return -EINVAL;
+	}
+
 	for (i = 0; i < num_regs; i++) {
 		ret = cs_dsp_wseq_write(dsp, wseq, reg_seq[i].reg,
 					reg_seq[i].def, op_code, update);
-- 
2.34.1