From 1d904eaf3f99565bdeffbed359e44dd88efbef02 Mon Sep 17 00:00:00 2001 From: Hyunchul Lee Date: Fri, 23 Jul 2021 13:01:06 +0900 Subject: [PATCH] ksmbd: fix -Wstringop-truncation warnings Kernel test bot reports the following warnings: In function 'ndr_write_string', inlined from 'ndr_encode_dos_attr' at fs/ksmbd/ndr.c:136:3: >> fs/ksmbd/ndr.c:70:2: warning: 'strncpy' destination unchanged after copying no bytes [-Wstringop-truncation] 70 | strncpy(PAYLOAD_HEAD(n), value, sz); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In function 'ndr_write_string', inlined from 'ndr_encode_dos_attr' at fs/ksmbd/ndr.c:134:3: >> fs/ksmbd/ndr.c:70:2: warning: 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation] 70 | strncpy(PAYLOAD_HEAD(n), value, sz); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/ksmbd/ndr.c: In function 'ndr_encode_dos_attr': fs/ksmbd/ndr.c:134:3: note: length computed here 134 | ndr_write_string(n, hex_attr, strlen(hex_attr)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Reported-by: kernel test robot Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/ksmbd/ndr.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/fs/ksmbd/ndr.c b/fs/ksmbd/ndr.c index cf0df78259c9..df23dfbaf657 100644 --- a/fs/ksmbd/ndr.c +++ b/fs/ksmbd/ndr.c @@ -65,13 +65,15 @@ static int ndr_write_bytes(struct ndr *n, void *value, size_t sz) return 0; } -static int ndr_write_string(struct ndr *n, void *value, size_t sz) +static int ndr_write_string(struct ndr *n, char *value) { + size_t sz; + + sz = strlen(value) + 1; if (n->length <= n->offset + sz) try_to_realloc_ndr_blob(n, sz); - strncpy(ndr_get_field(n), value, sz); - sz++; + memcpy(ndr_get_field(n), value, sz); n->offset += sz; n->offset = ALIGN(n->offset, 2); return 0; @@ -134,9 +136,9 @@ int ndr_encode_dos_attr(struct ndr *n, struct xattr_dos_attrib *da) if (da->version == 3) { snprintf(hex_attr, 10, "0x%x", da->attr); - ndr_write_string(n, hex_attr, strlen(hex_attr)); + ndr_write_string(n, hex_attr); } else { - ndr_write_string(n, "", strlen("")); + ndr_write_string(n, ""); } ndr_write_int16(n, da->version); ndr_write_int32(n, da->version);