linux-kernel - [PATCH] dm-crypt: remove ineffective comparison

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Message-ID: <20251001120254.24980-1-suchitkarunakaran@gmail.com>
Date: Wed,  1 Oct 2025 17:32:54 +0530
From: Suchit Karunakaran <suchitkarunakaran@...il.com>
To: akpm@...ux-foundation.org,
	bhe@...hat.com,
	vgoyal@...hat.com,
	dyoung@...hat.com,
	kexec@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	Suchit Karunakaran <suchitkarunakaran@...il.com>
Subject: [PATCH] dm-crypt: remove ineffective comparison

In restore_dm_crypt_keys_to_thread_keyring(), key_count is a global
variable declared as unsigned int. The comparison key_count < 0
is therefore always false and has no effect.
Remove the dead comparison to make the code clearer and
silence static analysis warnings.

Found by Coverity: CID#1649028

Signed-off-by: Suchit Karunakaran <suchitkarunakaran@...il.com>
---
 kernel/crash_dump_dm_crypt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c
index 401423ba477d..39cfc13ff350 100644
--- a/kernel/crash_dump_dm_crypt.c
+++ b/kernel/crash_dump_dm_crypt.c
@@ -115,7 +115,7 @@ static int restore_dm_crypt_keys_to_thread_keyring(void)
 
 	addr = dm_crypt_keys_addr;
 	dm_crypt_keys_read((char *)&key_count, sizeof(key_count), &addr);
-	if (key_count < 0 || key_count > KEY_NUM_MAX) {
+	if (key_count > KEY_NUM_MAX) {
 		kexec_dprintk("Failed to read the number of dm-crypt keys\n");
 		return -1;
 	}
-- 
2.51.0