[U-Boot] [PATCH 02/10] ext4: avoid calling ext4fs_mount() twice, which leaks

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Stephen,

> From: Stephen Warren <swarren@nvidia.com>
> 
> ext4_write_file() is only called from the "fs" layer, which calls both
> ext4fs_mount() and ext4fs_close() before/after calling
> ext4_write_file(). Fix ext4_write_file() not to call ext4fs_mount()
> again, since the mount operation malloc()s some RAM which is leaked
> when a second mount call over-writes the pointer to that data, if no
> intervening close call is made.
> 
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
>  fs/ext4/ext4_write.c | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
> index fbc4c4b1cc1a..fa67eb6a56b4 100644
> --- a/fs/ext4/ext4_write.c
> +++ b/fs/ext4/ext4_write.c
> @@ -986,26 +986,17 @@ int ext4_write_file(const char *filename, void
> *buf, loff_t offset, return -1;
>  	}
>  
> -	/* mount the filesystem */
> -	if (!ext4fs_mount(0)) {
> -		printf("** Error Bad ext4 partition **\n");
> -		goto fail;
> -	}
> -
>  	ret = ext4fs_write(filename, buf, len);
> -
>  	if (ret) {
>  		printf("** Error ext4fs_write() **\n");
>  		goto fail;
>  	}
> -	ext4fs_close();
>  
>  	*actwrite = len;
>  
>  	return 0;
>  
>  fail:
> -	ext4fs_close();
>  	*actwrite = 0;
>  
>  	return -1;


Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>

Test HW: Odroid XU3 - Exynos5433
[DFU tests]


-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group