linux-kernel - FAILED: Patch "staging: iio: frequency: ad9832: fix division by zero in ad9832_calc_freqreg()" failed to apply to v4.19-stable tree

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Message-ID: <20241106021433.184357-1-sashal@kernel.org>
Date: Tue,  5 Nov 2024 21:14:33 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	quzicheng@...wei.com
Cc: Nuno Sa <nuno.sa@...log.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "staging: iio: frequency: ad9832: fix division by zero in ad9832_calc_freqreg()" failed to apply to v4.19-stable tree

The patch below does not apply to the v4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 6bd301819f8f69331a55ae2336c8b111fc933f3d Mon Sep 17 00:00:00 2001
From: Zicheng Qu <quzicheng@...wei.com>
Date: Tue, 22 Oct 2024 13:43:54 +0000
Subject: [PATCH] staging: iio: frequency: ad9832: fix division by zero in
 ad9832_calc_freqreg()

In the ad9832_write_frequency() function, clk_get_rate() might return 0.
This can lead to a division by zero when calling ad9832_calc_freqreg().
The check if (fout > (clk_get_rate(st->mclk) / 2)) does not protect
against the case when fout is 0. The ad9832_write_frequency() function
is called from ad9832_write(), and fout is derived from a text buffer,
which can contain any value.

Link: https://lore.kernel.org/all/2024100904-CVE-2024-47663-9bdc@gregkh/
Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver")
Cc: stable@...r.kernel.org
Signed-off-by: Zicheng Qu <quzicheng@...wei.com>
Reviewed-by: Nuno Sa <nuno.sa@...log.com>
Reviewed-by: Dan Carpenter <dan.carpenter@...aro.org>
Link: https://patch.msgid.link/20241022134354.574614-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/staging/iio/frequency/ad9832.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 6c390c4eb26de..492612e8f8bad 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -129,12 +129,15 @@ static unsigned long ad9832_calc_freqreg(unsigned long mclk, unsigned long fout)
 static int ad9832_write_frequency(struct ad9832_state *st,
 				  unsigned int addr, unsigned long fout)
 {
+	unsigned long clk_freq;
 	unsigned long regval;
 
-	if (fout > (clk_get_rate(st->mclk) / 2))
+	clk_freq = clk_get_rate(st->mclk);
+
+	if (!clk_freq || fout > (clk_freq / 2))
 		return -EINVAL;
 
-	regval = ad9832_calc_freqreg(clk_get_rate(st->mclk), fout);
+	regval = ad9832_calc_freqreg(clk_freq, fout);
 
 	st->freq_data[0] = cpu_to_be16((AD9832_CMD_FRE8BITSW << CMD_SHIFT) |
 					(addr << ADD_SHIFT) |
-- 
2.43.0