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From:   Yafang Shao <laoar.shao@gmail.com>
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        Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH v5 05/15] drivers/infiniband: make setup_ctxt always get a nul terminated task comm
Date:   Thu, 21 Oct 2021 03:45:12 +0000
Message-Id: <20211021034516.4400-6-laoar.shao@gmail.com>
In-Reply-To: <20211021034516.4400-1-laoar.shao@gmail.com>
References: <20211021034516.4400-1-laoar.shao@gmail.com>
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Use TASK_COMM_LEN_16 instead of hard-coded 16 to make it more grepable,
and use strscpy_pad() instead of strlcpy() to make the comm always nul
terminated.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Petr Mladek <pmladek@suse.com>
---
 drivers/infiniband/hw/qib/qib.h          | 4 ++--
 drivers/infiniband/hw/qib/qib_file_ops.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index 9363bccfc6e7..8e59f9cbabc8 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -195,8 +195,8 @@ struct qib_ctxtdata {
 	/* pid of process using this ctxt */
 	pid_t pid;
 	pid_t subpid[QLOGIC_IB_MAX_SUBCTXT];
-	/* same size as task_struct .comm[], command that opened context */
-	char comm[16];
+	/* task_struct .comm[], command that opened context */
+	char comm[TASK_COMM_LEN_16];
 	/* pkeys set by this use of this ctxt */
 	u16 pkeys[4];
 	/* so file ops can get at unit */
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index 63854f4b6524..7ab2b448c183 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -1321,7 +1321,7 @@ static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
 	rcd->tid_pg_list = ptmp;
 	rcd->pid = current->pid;
 	init_waitqueue_head(&dd->rcd[ctxt]->wait);
-	strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
+	strscpy_pad(rcd->comm, current->comm, sizeof(rcd->comm));
 	ctxt_fp(fp) = rcd;
 	qib_stats.sps_ctxts++;
 	dd->freectxts--;
-- 
2.17.1