From 0ab5902e8ad93d0a9341dcce386b6c571ee02173 Mon Sep 17 00:00:00 2001 From: Vincenzo Maffione Date: Mon, 15 Mar 2021 17:39:18 +0000 Subject: netmap: fix memory leak in NETMAP_REQ_PORT_INFO_GET The netmap_ioctl() function has a reference counting bug in case of NETMAP_REQ_PORT_INFO_GET command. When `hdr->nr_name[0] == '\0'`, the function does not decrease the refcount of "nmd", which is increased by netmap_mem_find(), causing a refcount leak. Reported by: Xiyu Yang Submitted by: Carl Smith MFC after: 3 days PR: 254311 --- sys/dev/netmap/netmap.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'sys/dev/netmap/netmap.c') diff --git a/sys/dev/netmap/netmap.c b/sys/dev/netmap/netmap.c index f37900712046..f9698096b47a 100644 --- a/sys/dev/netmap/netmap.c +++ b/sys/dev/netmap/netmap.c @@ -2646,6 +2646,7 @@ netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data, case NETMAP_REQ_PORT_INFO_GET: { struct nmreq_port_info_get *req = (struct nmreq_port_info_get *)(uintptr_t)hdr->nr_body; + int nmd_ref = 0; NMG_LOCK(); do { @@ -2687,6 +2688,7 @@ netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data, error = EINVAL; break; } + nmd_ref = 1; } error = netmap_mem_get_info(nmd, &req->nr_memsize, &memflags, @@ -2704,6 +2706,8 @@ netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data, req->nr_host_rx_rings = na->num_host_rx_rings; } while (0); netmap_unget_na(na, ifp); + if (nmd_ref) + netmap_mem_put(nmd); NMG_UNLOCK(); break; } -- cgit v1.3