linux-kernel - [PATCH 2/2] iio: buffer-dma: fix type of 'i' in iio_dma_buffer_alloc

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Date:   Fri, 19 Feb 2021 10:58:26 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
CC:     <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <jic23@...nel.org>, <nuno.sa@...log.com>,
        <dragos.bogdan@...log.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 2/2] iio: buffer-dma: fix type of 'i' in iio_dma_buffer_alloc_blocks()

When unwinding the cleanup of the blocks, the type of 'i' is important to
be signed, so that the 'i >= 0' condition doesn't underflow and infinitely
loop (or just cause an access violation).

Fixes: ab925b044cfb ("iio: buffer-dma: Add mmap support")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/buffer/industrialio-buffer-dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iio/buffer/industrialio-buffer-dma.c b/drivers/iio/buffer/industrialio-buffer-dma.c
index d04479194cb4..83074d060535 100644
--- a/drivers/iio/buffer/industrialio-buffer-dma.c
+++ b/drivers/iio/buffer/industrialio-buffer-dma.c
@@ -707,8 +707,7 @@ int iio_dma_buffer_alloc_blocks(struct iio_buffer *buffer,
 	struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);
 	struct iio_dma_buffer_block **blocks;
 	unsigned int num_blocks;
-	unsigned int i;
-	int ret = 0;
+	int i, ret = 0;
 
 	mutex_lock(&queue->lock);
 
-- 
2.27.0