Re: [patch] dma-debug: debugfs_create_bool() takes a u32 pointer

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Mar 02, 2012 at 09:58:32AM +0300, Dan Carpenter wrote:
> Even though it has "bool" in the name, you have pass a u32 pointer to
> debugfs_create_bool().  Otherwise you get memory corruption in
> write_file_bool().  Fortunately in this case the corruption happens in
> an alignment hole between variables so it doesn't cause any problems.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> 
> diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> index 13ef233..08cd5a6 100644
> --- a/lib/dma-debug.c
> +++ b/lib/dma-debug.c
> @@ -78,7 +78,7 @@ static LIST_HEAD(free_entries);
>  static DEFINE_SPINLOCK(free_entries_lock);
>  
>  /* Global disable flag - will be set in case of an error */
> -static bool global_disable __read_mostly;
> +static u32 global_disable __read_mostly;
>  
>  /* Global error count */
>  static u32 error_count;
> @@ -657,7 +657,7 @@ static int dma_debug_fs_init(void)
>  
>  	global_disable_dent = debugfs_create_bool("disabled", 0444,
>  			dma_debug_dent,
> -			(u32 *)&global_disable);
> +			&global_disable);
>  	if (!global_disable_dent)
>  		goto out_err;
>  
> 


This certainly works, but a quick search of call sites shows this isn't the only
place someone passes a bool to debugfs_create_bool. I think the better solution
would be to change debugfs_create_bool and its corresponding read/write methods
to actually work with a bool type, and then clean all the call sites to pass in
a bool properly, instead of a u32.

Thanks
Neil

--
To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux