linux-kernel - [PATCH] crypto: stm32/crc32 - fix parsing list of devices

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Message-ID: <20231215111724.864051-1-thomas.bourgoin@foss.st.com>
Date: Fri, 15 Dec 2023 12:17:24 +0100
From: Thomas Bourgoin <thomas.bourgoin@...s.st.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller"
	<davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        Dan Carpenter <error27@...il.com>
CC: <linux-crypto@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Thomas Bourgoin <thomas.bourgoin@...s.st.com>,
        kernel test robot
	<lkp@...el.com>
Subject: [PATCH] crypto: stm32/crc32 - fix parsing list of devices

smatch warnings:
drivers/crypto/stm32/stm32-crc32.c:108 stm32_crc_get_next_crc() warn:
can 'crc' even be NULL?

Use list_first_entry_or_null instead of list_first_entry to retrieve
the first device registered.
The function list_first_entry always return a non NULL pointer even if
the list is empty. Hence checking if the pointer returned is NULL does
not tell if the list is empty or not.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/r/202311281111.ou2oUL2i-lkp@intel.com/
Reported-by: Dan Carpenter <error27@...il.com>
Closes: https://lore.kernel.org/r/202311281111.ou2oUL2i-lkp@intel.com/
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@...s.st.com>
---
 drivers/crypto/stm32/stm32-crc32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/stm32/stm32-crc32.c b/drivers/crypto/stm32/stm32-crc32.c
index b2d5c8921ab3..b0cf6d2fd352 100644
--- a/drivers/crypto/stm32/stm32-crc32.c
+++ b/drivers/crypto/stm32/stm32-crc32.c
@@ -104,7 +104,7 @@ static struct stm32_crc *stm32_crc_get_next_crc(void)
 	struct stm32_crc *crc;
 
 	spin_lock_bh(&crc_list.lock);
-	crc = list_first_entry(&crc_list.dev_list, struct stm32_crc, list);
+	crc = list_first_entry_or_null(&crc_list.dev_list, struct stm32_crc, list);
 	if (crc)
 		list_move_tail(&crc->list, &crc_list.dev_list);
 	spin_unlock_bh(&crc_list.lock);
-- 
2.25.1