[PATCH] drivers/iio: Remove all strcpy() uses in favor of strscpy()
From: Len Baker <hidden>
Date: 2021-08-01 17:12:42
Also in:
linux-iio, lkml
Subsystem:
iio subsystem and drivers, invensense mpu-6050 imu driver, the rest · Maintainers:
Jonathan Cameron, Jean-Baptiste Maneyrol, Linus Torvalds
strcpy() performs no bounds checking on the destination buffer. This could result in linear overflows beyond the end of the buffer, leading to all kinds of misbehaviors. The safe replacement is strscpy(). Signed-off-by: Len Baker <redacted> --- This is a task of the KSPP [1] [1] https://github.com/KSPP/linux/issues/88 drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
index f282e9cc34c5..3a6aa1c4bf6c 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_magn.c@@ -264,6 +264,7 @@ int inv_mpu_magn_set_orient(struct inv_mpu6050_state *st) const char *orient; char *str; int i; + size_t n; /* fill magnetometer orientation */ switch (st->chip_type) {
@@ -282,17 +283,18 @@ int inv_mpu_magn_set_orient(struct inv_mpu6050_state *st) for (i = 0; i < 3; ++i) { orient = st->orientation.rotation[6 + i]; /* use length + 2 for adding minus sign if needed */ - str = devm_kzalloc(regmap_get_device(st->map), - strlen(orient) + 2, GFP_KERNEL); + n = strlen(orient) + 2; + str = devm_kzalloc(regmap_get_device(st->map), n, + GFP_KERNEL); if (str == NULL) return -ENOMEM; if (strcmp(orient, "0") == 0) { - strcpy(str, orient); + strscpy(str, orient, n); } else if (orient[0] == '-') { - strcpy(str, &orient[1]); + strscpy(str, &orient[1], n); } else { str[0] = '-'; - strcpy(&str[1], orient); + strscpy(&str[1], orient, n - 1); } st->magn_orient.rotation[6 + i] = str; } --
2.25.1