hwrng: core - Don't use a stack buffer in add_early_randomness()

hw_random carefully avoids using a stack buffer except in
add_early_randomness().  This causes a crash in virtio_rng if
CONFIG_VMAP_STACK=y.

Reported-by: Matt Mullins <mmullins@mmlx.us>
Tested-by: Matt Mullins <mmullins@mmlx.us>
Fixes: d3cc7996473a ("hwrng: fetch randomness only after device init")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 4827945..d2d2c89 100644 (file)
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -84,14 +84,14 @@ static size_t rng_buffer_size(void)
 
 static void add_early_randomness(struct hwrng *rng)
 {
-       unsigned char bytes[16];
        int bytes_read;
+       size_t size = min_t(size_t, 16, rng_buffer_size());
 
        mutex_lock(&reading_mutex);
-       bytes_read = rng_get_data(rng, bytes, sizeof(bytes), 1);
+       bytes_read = rng_get_data(rng, rng_buffer, size, 1);
        mutex_unlock(&reading_mutex);
        if (bytes_read > 0)
-               add_device_randomness(bytes, bytes_read);
+               add_device_randomness(rng_buffer, bytes_read);
 }
 
 static inline void cleanup_rng(struct kref *kref)