linux-kernel - [PATCH][next] driver core: platform: fix u32 greater or equal to zero comparison

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Message-Id: <20200116175758.88396-1-colin.king@canonical.com>
Date:   Thu, 16 Jan 2020 17:57:58 +0000
From:   Colin King <colin.king@...onical.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Simon Schwartz <kern.simon@...schwartz.xyz>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] driver core: platform: fix u32 greater or equal to zero comparison

From: Colin Ian King <colin.king@...onical.com>

Currently the check that a u32 variable i is >= 0 is always true because
the unsigned variable will never be negative, causing the loop to run
forever.  Fix this by changing the pre-decrement check to a zero check on
i followed by a decrement of i.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 39cc539f90d0 ("driver core: platform: Prevent resouce overflow from causing infinite loops")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/base/platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 864b53b3d598..7fa654f1288b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -571,7 +571,7 @@ int platform_device_add(struct platform_device *pdev)
 		pdev->id = PLATFORM_DEVID_AUTO;
 	}
 
-	while (--i >= 0) {
+	while (i--) {
 		struct resource *r = &pdev->resource[i];
 		if (r->parent)
 			release_resource(r);
-- 
2.24.0