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Date: Tue, 12 Oct 2021 17:25:13 +0800
From: Yang Yingliang <yangyingliang@...wei.com>
To: <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
CC: <lars@...afoo.de>, <jic23@...nel.org>, <andy.shevchenko@...il.com>
Subject: [PATCH] iio: buffer: Fix double-free in iio_buffers_alloc_sysfs_and_mask()
When __iio_buffer_alloc_sysfs_and_mask() failed, 'unwind_idx' should be
set to 'i - 1' to prevent double-free when cleanup resources.
BUG: KASAN: double-free or invalid-free in __iio_buffer_free_sysfs_and_mask+0x32/0xb0 [industrialio]
Call Trace:
kfree+0x117/0x4c0
__iio_buffer_free_sysfs_and_mask+0x32/0xb0 [industrialio]
iio_buffers_alloc_sysfs_and_mask+0x60d/0x1570 [industrialio]
__iio_device_register+0x483/0x1a30 [industrialio]
ina2xx_probe+0x625/0x980 [ina2xx_adc]
Reported-by: Hulk Robot <hulkci@...wei.com>
Fixes: ee708e6baacd ("iio: buffer: introduce support for attaching more IIO buffers")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
drivers/iio/industrialio-buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index a95cc2da56be..5f4bd0b73d03 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1616,7 +1616,7 @@ int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
buffer = iio_dev_opaque->attached_buffers[i];
ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, i);
if (ret) {
- unwind_idx = i;
+ unwind_idx = i - 1;
goto error_unwind_sysfs_and_mask;
}
}
--
2.25.1
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