ucma_accept() is reading uninitialized memory when `in_len` is less than `offsetof(struct rdma_ucm_accept, ece)`. Fix it. Reported-and-tested-by: syzbot+086ab5ca9eafd2379aa6@xxxxxxxxxxxxxxxxxxxxxxxxx Link: https://syzkaller.appspot.com/bug?id=0bce3bb68cb383fce92f78444e3ef77c764b60ad Signed-off-by: Peilin Ye <yepeilin.cs@xxxxxxxxx> --- Change in v2: - syzbot has reported this bug as "KMSAN: uninit-value in xa_load". Add "Reported-and-tested-by:" and "Link:" tags for it. 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
