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iio: iio_enum_available_read: Prevent possible buffer overflow

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Use scnprint instead of snprintf, because snprintf returns the number of bytes
that would have been written to the buffer if there was enough space, and as a
result writing to buf[len-1] might cause a access beyond the buffers limits.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen 2012-06-05 18:24:12 +02:00 committed by Greg Kroah-Hartman
parent a21e6bfeb4
commit 74dcd439bf
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/industrialio-core.c
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@ -300,7 +300,7 @@ ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
return 0;
for (i = 0; i < e->num_items; ++i)
len += snprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
/* replace last space with a newline */
buf[len - 1] = '\n';