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From: Muhammad Bilal <meatuni001@gmail.com>
To: platform-driver-x86@vger.kernel.org
Cc: jorge.lopez2@hp.com, hansg@kernel.org,
	ilpo.jarvinen@linux.intel.com, linux@weissschuh.net,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Muhammad Bilal <meatuni001@gmail.com>
Subject: [PATCH v3 2/2] platform/x86: hp-bioscfg: remove dead bounds check in audit_log_entries_show
Date: Wed, 19 Aug 2026 00:11:08 +0500	[thread overview]
Message-ID: <20260818191120.38556-3-meatuni001@gmail.com> (raw)
In-Reply-To: <20260818191120.38556-1-meatuni001@gmail.com>

audit_log_entries_show() checks "count * LOG_ENTRY_SIZE > PAGE_SIZE"
prior to entering the loop. Because "count" is already bounded to fit
within PAGE_SIZE, the inner loop check "(LOG_ENTRY_SIZE * i) > PAGE_SIZE"
can never be reached and is dead code.

Remove the redundant inner bounds check and eliminate the unnecessary
"else" block after "break" to clean up the loop control flow.

Signed-off-by: Muhammad Bilal <meatuni001@gmail.com>
---
Changes in v3:
  - Remove the dead inner loop check completely instead of adjusting
    the boundary arithmetic, as noted by Ilpo Järvinen.
  - Remove the redundant else block after break.

Changes in v2:
  - None for this patch; resubmitted as part of the v2 series.

Link: https://lore.kernel.org/r/20260803143037.93105-1-meatuni001@gmail.com [v1]
Link: https://lore.kernel.org/r/20260812111829.172273-1-meatuni001@gmail.com [v2]
---
 drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c
index b57e42f29282..3b20757a3e74 100644
--- a/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c
+++ b/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c
@@ -93,15 +93,12 @@ static ssize_t audit_log_entries_show(struct kobject *kobj,
 					   HPWMI_SURESTART,
 					   audit_log_buffer, 1, 128);
 
-		if (ret < 0 || (LOG_ENTRY_SIZE * i) > PAGE_SIZE) {
-			/*
-			 * Encountered a failure while reading
-			 * individual logs. Only a partial list of
-			 * audit log will be returned.
-			 */
+		/*
+		 * Encountered a failure while reading individual logs.
+		 * Only a partial list of audit log will be returned.
+		 */
+		if (ret < 0)
 			break;
-		} else {
-			memcpy(buf, audit_log_buffer, LOG_ENTRY_SIZE);
-			buf += LOG_ENTRY_SIZE;
-		}
+
+		memcpy(buf, audit_log_buffer, LOG_ENTRY_SIZE);
+		buf += LOG_ENTRY_SIZE;
 	}
 
 	return i * LOG_ENTRY_SIZE;
-- 
2.43.0

      parent reply	other threads:[~2026-08-18 19:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-18 19:11 [PATCH v3 0/2] platform/x86: hp-bioscfg: fix empty auth token overflow and clean up audit log loop Muhammad Bilal
2026-08-18 19:11 ` [PATCH v3 1/2] platform/x86: hp-bioscfg: fix 16-byte heap overflow for empty auth token Muhammad Bilal
2026-08-18 19:11 ` Muhammad Bilal [this message]

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