Re: [PATCH] s390: scsi: zfcp_aux.c: Cleaning up missing null-terminate in conjunction with strncpy

From: Steffen Maier
Date: Mon Jul 28 2014 - 10:25:36 EST

On 07/26/2014 04:36 PM, Rickard Strandqvist wrote:
Replacing strncpy with strlcpy to avoid strings that lacks null terminate.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@xxxxxxxxxxxxxxxxxx>
drivers/s390/scsi/zfcp_aux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 8004b07..a23ba76 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -101,7 +101,7 @@ static void __init zfcp_init_device_setup(char *devstr)
token = strsep(&str, ",");
if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
goto err_out;

Due to the check for strlen(token) >= ZFCP_BUS_ID_SIZE we should be safe even with strlcpy because we would reject any user string that does not fit into busid including the trailing zero character.

Since it works either way, we can change it though,

Acked-by: Steffen Maier <maier@xxxxxxxxxxxxxxxxxx>

- strncpy(busid, token, ZFCP_BUS_ID_SIZE);
+ strlcpy(busid, token, ZFCP_BUS_ID_SIZE);

token = strsep(&str, ",");
if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn))

Mit freundlichen Grüßen / Kind regards
Steffen Maier

Linux on System z Development

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