linux-kernel - Re: [PATCH] return hidden bug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 22 Oct 2007 03:53:30 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	Rik van Riel <riel@...hat.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] return hidden bug

Rik van Riel wrote:
> On Mon, 22 Oct 2007 03:05:05 +0200
> Roel Kluin <12o3l@...cali.nl> wrote:
> 
>>     return hidden bug
>>     
>>     Signed-off-by: Roel Kluin <12o3l@...cali.nl>
>>
>> diff --git a/arch/alpha/kernel/pci_iommu.c
>> b/arch/alpha/kernel/pci_iommu.c index e1c4707..6a69425 100644
>> --- a/arch/alpha/kernel/pci_iommu.c
>> +++ b/arch/alpha/kernel/pci_iommu.c
>> @@ -365,8 +365,8 @@ pci_unmap_single(struct pci_dev *pdev, dma_addr_t
>> dma_addr, size_t size, printk(KERN_ERR "Bogus pci_unmap_single:
>> dma_addr %lx " " base %lx size %x\n", dma_addr, arena->dma_base,
>>  		       arena->size);
>> -		return;
>>  		BUG();
>> +		return;
>>  	}
>>  
>>  	npages = calc_npages((dma_addr & ~PAGE_MASK) + size);
> 
> BUG() will terminate the process that runs into it, so you can
> just remove the return alltogether.  If BUG() is hit, the return
> will never be reached.
> 
---
    hidden bug returns
    
    Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index e1c4707..ca55c33 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -365,7 +365,6 @@ pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size,
 		printk(KERN_ERR "Bogus pci_unmap_single: dma_addr %lx "
 		       " base %lx size %x\n", dma_addr, arena->dma_base,
 		       arena->size);
-		return;
 		BUG();
 	}
 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/