linux-kernel - [PATCH 4/6] hw_random: only set cur_rng_set_by

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Date:   Mon, 24 Jan 2022 21:29:49 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        "Jason A . Donenfeld" <Jason@...c4.com>
Subject: [PATCH 4/6] hw_random: only set cur_rng_set_by_user if it is working

In case the user-specified rng device is not working, it is not used;
therefore cur_rng_set_by_user must not be set to 1.

Cc: Matt Mackall <mpm@...enic.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
---
 drivers/char/hw_random/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 89891ac87af0..9405fcdace38 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -335,8 +335,9 @@ static ssize_t rng_current_store(struct device *dev,
 	} else {
 		list_for_each_entry(rng, &rng_list, list) {
 			if (sysfs_streq(rng->name, buf)) {
-				cur_rng_set_by_user = 1;
 				err = set_current_rng(rng);
+				if (!err)
+					cur_rng_set_by_user = 1;
 				break;
 			}
 		}
-- 
2.34.1