6.15-stable review patch. If anyone has any objections, please let me know.
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From: Markus Burri markus.burri@mt.com
[ Upstream commit 16285a0931869baa618b1f5d304e1e9d090470a8 ]
The buffer is set to 20 characters. If a caller write more characters, count is truncated to the max available space in "simple_write_to_buffer". To protect from OoB access, check that the input size fit into buffer and add a zero terminator after copy to the end of the copied data.
Fixes: 6d5dd486c715 iio: core: make use of simple_write_to_buffer() Signed-off-by: Markus Burri markus.burri@mt.com Link: https://patch.msgid.link/20250508130612.82270-4-markus.burri@mt.com Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/industrialio-core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index b9f4113ae5fc3..ebf17ea5a5f93 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -410,12 +410,15 @@ static ssize_t iio_debugfs_write_reg(struct file *file, char buf[80]; int ret;
+ if (count >= sizeof(buf)) + return -EINVAL; + ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count); if (ret < 0) return ret;
- buf[count] = '\0'; + buf[ret] = '\0';
ret = sscanf(buf, "%i %i", ®, &val);