linux-kernel - [PATCH] kernel: dma-debug: fix return value of _

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Date:   Mon, 28 Feb 2022 14:04:53 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Igor Zhbanov <i.zhbanov@...russia.ru>,
        Joerg Roedel <joro@...tes.org>, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>
Subject: [PATCH] kernel: dma-debug: fix return value of __setup handlers

When valid kernel command line parameters
  dma_debug=off dma_debug_entries=100
are used, they are reported as Unknown parameters and added to init's
environment strings, polluting it.

  Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc5
    dma_debug=off dma_debug_entries=100", will be passed to user space.

and

 Run /sbin/init as init process
   with arguments:
     /sbin/init
   with environment:
     HOME=/
     TERM=linux
     BOOT_IMAGE=/boot/bzImage-517rc5
     dma_debug=off
     dma_debug_entries=100

Return 1 from these __setup handlers to indicate that the command line
option has been handled.

Fixes: 59d3daafa1726 ("dma-debug: add kernel command line parameters")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Igor Zhbanov <i.zhbanov@...russia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@...russia.ru
Cc: Joerg Roedel <joro@...tes.org>
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: iommu@...ts.linux-foundation.org
Cc: Robin Murphy <robin.murphy@....com>
---
 kernel/dma/debug.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20220228.orig/kernel/dma/debug.c
+++ linux-next-20220228/kernel/dma/debug.c
@@ -927,7 +927,7 @@ static __init int dma_debug_cmdline(char
 		global_disable = true;
 	}
 
-	return 0;
+	return 1;
 }
 
 static __init int dma_debug_entries_cmdline(char *str)
@@ -936,7 +936,7 @@ static __init int dma_debug_entries_cmdl
 		return -EINVAL;
 	if (!get_option(&str, &nr_prealloc_entries))
 		nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
-	return 0;
+	return 1;
 }
 
 __setup("dma_debug=", dma_debug_cmdline);