From 52baa51d30573273341b78a3e3ed0d9a845d3e55 Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg Date: Wed, 12 Dec 2018 11:50:00 +1000 Subject: [PATCH] cifs: remove coverity warning in calc_lanman_hash password_with_pad is a fixed size buffer of 16 bytes, it contains a password string, to be padded with \0 if shorter than 16 bytes but is just truncated if longer. It is not, and we do not depend on it to be, nul terminated. As such, do not use strncpy() to populate this buffer since the str* prefix suggests that this is a string, which it is not, and it also confuses coverity causing a false warning. Detected by CoverityScan CID#113743 ("Buffer not null terminated") Signed-off-by: Ronnie Sahlberg Signed-off-by: Steve French --- fs/cifs/cifsencrypt.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index ecdff344e8fe..d2a05e46d6f5 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -304,12 +304,17 @@ int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp) int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, char *lnm_session_key) { - int i; + int i, len; int rc; char password_with_pad[CIFS_ENCPWD_SIZE] = {0}; - if (password) - strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE); + if (password) { + for (len = 0; len < CIFS_ENCPWD_SIZE; len++) + if (!password[len]) + break; + + memcpy(password_with_pad, password, len); + } if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { memcpy(lnm_session_key, password_with_pad,