diff options
| author | Vincenzo Maffione <vmaffione@FreeBSD.org> | 2021-03-15 17:39:18 +0000 |
|---|---|---|
| committer | Vincenzo Maffione <vmaffione@FreeBSD.org> | 2021-03-18 16:41:17 +0000 |
| commit | 09b2bde74654a16c56ade52411c464ef79de8cd4 (patch) | |
| tree | 9b1febd62839ef86ef4cb444f5568e53a6d40519 | |
| parent | a54c346ff3e80ff8f2f3d0ec56b5374a7dc34429 (diff) | |
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 <sherllyyang00@gmail.com>
Submitted by: Carl Smith <carl.smith@alliedtelesis.co.nz>
MFC after: 3 days
PR: 254311
(cherry picked from commit 0ab5902e8ad93d0a9341dcce386b6c571ee02173)
| -rw-r--r-- | sys/dev/netmap/netmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/dev/netmap/netmap.c b/sys/dev/netmap/netmap.c index ca5af6ab5217..6532856b21a1 100644 --- a/sys/dev/netmap/netmap.c +++ b/sys/dev/netmap/netmap.c @@ -2636,6 +2636,7 @@ 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 { @@ -2677,6 +2678,7 @@ 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, @@ -2694,6 +2696,8 @@ 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; } |