6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Heiko Carstens <hca@xxxxxxxxxxxxx>
commit f7cf22424665043787a96a66a048ff6b2cfd473c upstream.
Building dasd_eckd.o with latest clang reveals this bug:
CC drivers/s390/block/dasd_eckd.o
drivers/s390/block/dasd_eckd.c:1082:3: warning: 'snprintf' will always be truncated;
specified size is 1, but format string expands to at least 11 [-Wfortify-source]
1082 | snprintf(print_uid, sizeof(*print_uid),
| ^
drivers/s390/block/dasd_eckd.c:1087:3: warning: 'snprintf' will always be truncated;
specified size is 1, but format string expands to at least 10 [-Wfortify-source]
1087 | snprintf(print_uid, sizeof(*print_uid),
| ^
Fix this by moving and using the existing UID_STRLEN for the arrays
that are being written to. Also rename UID_STRLEN to DASD_UID_STRLEN
to clarify its scope.
Fixes: 23596961b437 ("s390/dasd: split up dasd_eckd_read_conf")
Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> # build
Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Closes: https://github.com/ClangBuiltLinux/linux/issues/1923
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230828153142.2843753-2-hca@xxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/block/dasd_devmap.c | 6 +-----
drivers/s390/block/dasd_eckd.c | 10 +++++-----
drivers/s390/block/dasd_int.h | 4 ++++
3 files changed, 10 insertions(+), 10 deletions(-)
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -1378,16 +1378,12 @@ static ssize_t dasd_vendor_show(struct d
static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
-#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
- /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
- /* vduit */ 32 + 1)
-
static ssize_t
dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
+ char uid_string[DASD_UID_STRLEN];
struct dasd_device *device;
struct dasd_uid uid;
- char uid_string[UID_STRLEN];
char ua_string[3];
device = dasd_device_from_cdev(to_ccwdev(dev));
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1079,12 +1079,12 @@ static void dasd_eckd_get_uid_string(str
create_uid(conf, &uid);
if (strlen(uid.vduit) > 0)
- snprintf(print_uid, sizeof(*print_uid),
+ snprintf(print_uid, DASD_UID_STRLEN,
"%s.%s.%04x.%02x.%s",
uid.vendor, uid.serial, uid.ssid,
uid.real_unit_addr, uid.vduit);
else
- snprintf(print_uid, sizeof(*print_uid),
+ snprintf(print_uid, DASD_UID_STRLEN,
"%s.%s.%04x.%02x",
uid.vendor, uid.serial, uid.ssid,
uid.real_unit_addr);
@@ -1093,8 +1093,8 @@ static void dasd_eckd_get_uid_string(str
static int dasd_eckd_check_cabling(struct dasd_device *device,
void *conf_data, __u8 lpm)
{
+ char print_path_uid[DASD_UID_STRLEN], print_device_uid[DASD_UID_STRLEN];
struct dasd_eckd_private *private = device->private;
- char print_path_uid[60], print_device_uid[60];
struct dasd_conf path_conf;
path_conf.data = conf_data;
@@ -1293,9 +1293,9 @@ static void dasd_eckd_path_available_act
__u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
__u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
struct dasd_conf_data *conf_data;
+ char print_uid[DASD_UID_STRLEN];
struct dasd_conf path_conf;
unsigned long flags;
- char print_uid[60];
int rc, pos;
opm = 0;
@@ -5855,8 +5855,8 @@ static void dasd_eckd_dump_sense(struct
static int dasd_eckd_reload_device(struct dasd_device *device)
{
struct dasd_eckd_private *private = device->private;
+ char print_uid[DASD_UID_STRLEN];
int rc, old_base;
- char print_uid[60];
struct dasd_uid uid;
unsigned long flags;
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -259,6 +259,10 @@ struct dasd_uid {
char vduit[33];
};
+#define DASD_UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 + \
+ /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 + \
+ /* vduit */ 32 + 1)
+
/*
* PPRC Status data
*/
