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hwrng: core - reject unknown RNG names

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In rng_current_store(), err is 0 after successfully locking rng_mutex,
and if the requested RNG name cannot be found, the function reports
success even though the current RNG was not changed.

Set err = -ENODEV before searching the RNG list to reject unknown names.

Fixes: 142a27f0a7 ("hwrng: core - Reset user selected rng by writing "" to rng_current")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <blum@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Thorsten Blum 2026-09-24 23:21:13 +02:00 committed by Herbert Xu
parent 8c515ff875
commit 7e7be88151
1 changed files with 1 additions and 0 deletions
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drivers/char/hw_random/core.c
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@ -376,6 +376,7 @@ static ssize_t rng_current_store(struct device *dev,
cur_rng_set_by_user = 1;
drop_current_rng();
} else {
err = -ENODEV;
list_for_each_entry(rng, &rng_list, list) {
if (sysfs_streq(rng->name, buf)) {
err = set_current_rng(rng);