4.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Schwidefsky <schwidef...@de.ibm.com>
commit 17fb874dee093139923af8ed36061faa92cc8e79 upstream.
The kthread_run() function can return two different error values
but the hwrng core only checks for -ENOMEM. If the other error
value -EINTR is returned it is assigned to hwrng_fill and later
used on a kthread_stop() call which naturally crashes.
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/char/hw_random/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -429,7 +429,7 @@ static int hwrng_fillfn(void *unused)
static void start_khwrngd(void)
{
hwrng_fill = kthread_run(hwrng_fillfn, NULL, "hwrng");
- if (hwrng_fill == ERR_PTR(-ENOMEM)) {
+ if (IS_ERR(hwrng_fill)) {
pr_err("hwrng_fill thread creation failed");
hwrng_fill = NULL;
}
--
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