Re: [PATCH 09/14] staging: westbridge: improve error path

[walter harms <wharms@bfs.de>]

Kulikov Vasiliy schrieb:
> From: Vasiliy Kulikov <segooon@gmail.com>
> 
> kmalloc() may fail, check for it.
> Allocated memory is not freed.
> Use IS_ERR() instead of strict checking.
> 
> Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
> ---
>  I couldn't compile this driver at all, so it is not tested.
> 
>  .../staging/westbridge/astoria/gadget/cyasgadget.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/staging/westbridge/astoria/gadget/cyasgadget.c b/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
> index ced239d..48080b3 100644
> --- a/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
> +++ b/drivers/staging/westbridge/astoria/gadget/cyasgadget.c
> @@ -1123,6 +1123,8 @@ static int cyasgadget_ioctl(
>  
>  		/* better use fixed size buff*/
>  		alloc_filename = kmalloc(k_d.name_length + 1, GFP_KERNEL);
> +		if (alloc_filename == NULL)
> +			return -ENOMEM;
>  
>  		/* get the filename */
>  		if (copy_from_user(alloc_filename, k_d.file_name,
> @@ -1132,12 +1134,13 @@ static int cyasgadget_ioctl(
>  				"copy file name from user space failed\n",
>  				__func__);
>  			#endif
> +			kfree(alloc_filename);
>  			return -EFAULT;
>  		}
>  
>  		file_to_allocate = filp_open(alloc_filename, O_RDWR, 0);
>  
> -		if ((int)file_to_allocate != 0xfffffffe) {
> +		if (!IS_ERR(file_to_allocate)) {
>  
>  			struct address_space *mapping =
>  				file_to_allocate->f_mapping;
> @@ -1379,6 +1382,7 @@ static int cyasgadget_ioctl(
>  				__func__, alloc_filename);
>  		} /* end if (file_to_allocate)*/
>  		#endif
> +		kfree(alloc_filename);
>  initsoj_safe_exit:
>  			ret_stat = 0;
>  			retval = __put_user(ret_stat,
> @@ -1410,12 +1414,15 @@ initsoj_safe_exit:
>  				return -EFAULT;
>  
>  		map_filename = kmalloc(k_d.name_length + 1, GFP_KERNEL);
> +		if (map_filename == NULL)
> +			return -ENOMEM;
>  		if (copy_from_user(map_filename, k_d.file_name,
>  			k_d.name_length + 1)) {
>  			#ifndef WESTBRIDGE_NDEBUG
>  			cy_as_hal_print_message("%s: copy file name from "
>  				"user space failed\n", __func__);
>  			#endif
> +			kfree(map_filename);
>  			return -EFAULT;
>  		}

the indention should be fixed also.

re,
 wh



> @@ -1561,6 +1568,7 @@ initsoj_safe_exit:
>  					__func__, map_filename);
>  		}
>  		#endif
> +		kfree(map_filename);
>  
>  		ret_stat = 0;
>  		retval = __put_user(ret_stat, (uint32_t __user *)