[PATCH 4.14 54/55] net: qed: use correct strncpy() size

Greg Kroah-Hartman
2018-12-06T14:44:10Z

From: Arnd Bergmann <arnd@arndb.de>

commit 11f711081af0eb54190dc0de96ba4a9cd494666b upstream.

passing the strlen() of the source string as the destination
length is pointless, and gcc-8 now warns about it:

drivers/net/ethernet/qlogic/qed/qed_debug.c: In function 'qed_grc_dump':
include/linux/string.h:253: error: 'strncpy' specified bound depends on the length of the source argument [-Werror=stringop-overflow=]

This changes qed_grc_dump_big_ram() to instead uses the length of
the destination buffer, and use strscpy() to guarantee nul-termination.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/ethernet/qlogic/qed/qed_debug.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/qlogic/qed/qed_debug.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_debug.c
@@ -3590,10 +3590,8 @@ static u32 qed_grc_dump_big_ram(struct q
total_blocks = big_ram->num_of_blocks[dev_data->chip_id];
ram_size = total_blocks * BIG_RAM_BLOCK_SIZE_DWORDS;

- strncpy(type_name, big_ram->instance_name,
- strlen(big_ram->instance_name));
- strncpy(mem_name, big_ram->instance_name,
- strlen(big_ram->instance_name));
+ strscpy(type_name, big_ram->instance_name, sizeof(type_name));
+ strscpy(mem_name, big_ram->instance_name, sizeof(mem_name));

/* Dump memory header */
offset += qed_grc_dump_mem_hdr(p_hwfn,