[Linux-kernel-mentees] [PATCH] infiniband: Prevent uninit-value in ucma_accept()

Peilin Ye yepeilin.cs at gmail.com
Sat Jul 25 22:02:03 UTC 2020


ucma_accept() is reading uninitialized memory when `in_len` is
less than `offsetof(struct rdma_ucm_accept, ece)`. Fix it.

Signed-off-by: Peilin Ye <yepeilin.cs at gmail.com>
---
 drivers/infiniband/core/ucma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index a591fdccdce0..842d297903c0 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1134,7 +1134,7 @@ static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 			   int in_len, int out_len)
 {
-	struct rdma_ucm_accept cmd;
+	struct rdma_ucm_accept cmd = {};
 	struct rdma_conn_param conn_param;
 	struct rdma_ucm_ece ece = {};
 	struct ucma_context *ctx;
-- 
2.25.1



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