linux-kernel - Re: [PATCH v2] Staging: exfat: Avoid use of strcpy

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Message-Id: <EAFF08E1-747C-4084-BFEF-A89465A6F9ED@volery.com>
Date:   Wed, 11 Sep 2019 12:24:23 +0200
From:   Sandro Volery <sandro@...ery.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     valdis.kletnieks@...edu, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux@...musvillemoes.dk
Subject: Re: [PATCH v2] Staging: exfat: Avoid use of strcpy



> On 11 Sep 2019, at 12:06, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> 
> On Wed, Sep 11, 2019 at 11:42:19AM +0200, Sandro Volery wrote:
>> Use strscpy instead of strcpy in exfat_core.c, and add a check
>> for length that will return already known FFS_INVALIDPATH.
>> 
>> Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
>> Signed-off-by: Sandro Volery <sandro@...ery.com>
>> ---
>> v2: Implement length check and return in one
>> v1: Original Patch
>> drivers/staging/exfat/exfat_core.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
>> index da8c58149c35..4c40f1352848 100644
>> --- a/drivers/staging/exfat/exfat_core.c
>> +++ b/drivers/staging/exfat/exfat_core.c
>> @@ -2964,7 +2964,8 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
>>    if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
>        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Delete this as it is no longer required.
> 

Yep, saw it from Rasmus response too just now.. Dumb mistake.
Will fix this this afternoon.

Sandro V

>>        return FFS_INVALIDPATH;
>> 
>> -    strcpy(name_buf, path);
>> +    if (strscpy(name_buf, path, sizeof(name_buf)) < 0)
>> +        return FFS_INVALIDPATH;
>