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Message-ID: <20241031014626.2313077-1-quzicheng@huawei.com>
Date: Thu, 31 Oct 2024 01:46:26 +0000
From: Zicheng Qu <quzicheng@...wei.com>
To: <mazziesaccount@...il.com>, <jic23@...nel.org>, <lars@...afoo.de>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <tanghui20@...wei.com>, <zhangqiao22@...wei.com>,
<judy.chenhui@...wei.com>, <quzicheng@...wei.com>
Subject: [PATCH] iio: fix infinite loop for gain_to_scaletables()
In iio_gts_build_avail_time_table(), it is checked that gts->num_itime is
non-zero, but gts->num_itime is not checked in gain_to_scaletables(). The
variable time_idx is initialized as gts->num_itime - 1. This implies that
time_idx might initially be set to -1 (0 - 1 = -1). Consequently, using
while (time_idx--) could lead to an infinite loop.
Cc: stable@...r.kernel.org # v6.6+
Fixes: 38416c28e168 ("iio: light: Add gain-time-scale helpers")
Signed-off-by: Zicheng Qu <quzicheng@...wei.com>
---
drivers/iio/industrialio-gts-helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/industrialio-gts-helper.c b/drivers/iio/industrialio-gts-helper.c
index 59d7615c0f56..f3acd392f4fc 100644
--- a/drivers/iio/industrialio-gts-helper.c
+++ b/drivers/iio/industrialio-gts-helper.c
@@ -205,7 +205,7 @@ static int gain_to_scaletables(struct iio_gts *gts, int **gains, int **scales)
memcpy(all_gains, gains[time_idx], gain_bytes);
new_idx = gts->num_hwgain;
- while (time_idx--) {
+ while (time_idx-- > 0) {
for (j = 0; j < gts->num_hwgain; j++) {
int candidate = gains[time_idx][j];
int chk;
--
2.34.1
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