From: Lidza Louina Date: Mon, 16 May 2016 18:51:42 +0000 (-0400) Subject: staging/lustre/ptlrpc: Removes potential null dereference X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=db3c16cdde24ecd59df0f24f93f1a4ba177f4b82;p=deliverable%2Flinux.git staging/lustre/ptlrpc: Removes potential null dereference The lustre_msg_buf method could return NULL. Subsequent code didn't check if it's null before using it. This patch adds two checks. Signed-off-by: Lidza Louina Acked-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec.c b/drivers/staging/lustre/lustre/ptlrpc/sec.c index 187fd1d6898c..657b41fdf4c5 100644 --- a/drivers/staging/lustre/lustre/ptlrpc/sec.c +++ b/drivers/staging/lustre/lustre/ptlrpc/sec.c @@ -2196,6 +2196,9 @@ int sptlrpc_pack_user_desc(struct lustre_msg *msg, int offset) pud = lustre_msg_buf(msg, offset, 0); + if (!pud) + return -EINVAL; + pud->pud_uid = from_kuid(&init_user_ns, current_uid()); pud->pud_gid = from_kgid(&init_user_ns, current_gid()); pud->pud_fsuid = from_kuid(&init_user_ns, current_fsuid()); diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec_plain.c b/drivers/staging/lustre/lustre/ptlrpc/sec_plain.c index 37c9f4c453de..ec8edbf7516d 100644 --- a/drivers/staging/lustre/lustre/ptlrpc/sec_plain.c +++ b/drivers/staging/lustre/lustre/ptlrpc/sec_plain.c @@ -574,8 +574,12 @@ int plain_alloc_reqbuf(struct ptlrpc_sec *sec, lustre_init_msg_v2(req->rq_reqbuf, PLAIN_PACK_SEGMENTS, buflens, NULL); req->rq_reqmsg = lustre_msg_buf(req->rq_reqbuf, PLAIN_PACK_MSG_OFF, 0); - if (req->rq_pack_udesc) - sptlrpc_pack_user_desc(req->rq_reqbuf, PLAIN_PACK_USER_OFF); + if (req->rq_pack_udesc) { + int rc = sptlrpc_pack_user_desc(req->rq_reqbuf, + PLAIN_PACK_USER_OFF); + if (rc < 0) + return rc; + } return 0; }