diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hw_random/core.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 57c51efa5613..018316f54621 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -181,8 +181,15 @@ static inline int rng_get_data(struct hwrng *rng, u8 *buffer, size_t size, int present; BUG_ON(!mutex_is_locked(&reading_mutex)); - if (rng->read) - return rng->read(rng, (void *)buffer, size, wait); + if (rng->read) { + int err; + + err = rng->read(rng, buffer, size, wait); + if (WARN_ON_ONCE(err > 0 && err > size)) + err = size; + + return err; + } if (rng->data_present) present = rng->data_present(rng, wait); |