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Commit 7a64d15d authored by Chenyuan Mi's avatar Chenyuan Mi Committed by Greg Kroah-Hartman
Browse files

tools: iio: iio_generic_buffer: Fix some integer type and calculation 



[ Upstream commit 49d736313d0975ddeb156f4f59801da833f78b30 ]

In function size_from_channelarray(), the return value 'bytes' is defined
as int type. However, the calcution of 'bytes' in this function is designed
to use the unsigned int type. So it is necessary to change 'bytes' type to
unsigned int to avoid integer overflow.

The size_from_channelarray() is called in main() function, its return value
is directly multipled by 'buf_len' and then used as the malloc() parameter.
The 'buf_len' is completely controllable by user, thus a multiplication
overflow may occur here. This could allocate an unexpected small area.

Signed-off-by: default avatarChenyuan Mi <michenyuan@huawei.com>
Link: https://lore.kernel.org/r/20230725092407.62545-1-michenyuan@huawei.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Stable-dep-of: 2d3dff577dd0 ("tools: iio: iio_generic_buffer ensure alignment")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent db6d5b9f

tools/iio/iio_generic_buffer.c

+13 −4
Original line number Diff line number Diff line
@@ -49,9 +49,9 @@ enum autochan { 
 * Has the side effect of filling the channels[i].location values used

 * in processing the buffer output.

 **/

static int size_from_channelarray(struct iio_channel_info *channels, int num_channels)

static unsigned int size_from_channelarray(struct iio_channel_info *channels, int num_channels)

{

	int bytes = 0;

	unsigned int bytes = 0;

	int i = 0;



	while (i < num_channels) {
@@ -342,7 +342,7 @@ int main(int argc, char **argv) 
	ssize_t read_size;

	int dev_num = -1, trig_num = -1;

	char *buffer_access = NULL;

	int scan_size;

	unsigned int scan_size;

	int noevents = 0;

	int notrigger = 0;

	char *dummy;
@@ -612,7 +612,16 @@ int main(int argc, char **argv) 
	}



	scan_size = size_from_channelarray(channels, num_channels);

	data = malloc(scan_size * buf_len);



	size_t total_buf_len = scan_size * buf_len;



	if (scan_size > 0 && total_buf_len / scan_size != buf_len) {

		ret = -EFAULT;

		perror("Integer overflow happened when calculate scan_size * buf_len");

		goto error;

	}



	data = malloc(total_buf_len);

	if (!data) {

		ret = -ENOMEM;

		goto error;