Make sure port value read from user space by write_ports is valid before
passing it to svc_find_xprt(). If it wasn't, the writer would get ENOENT
instead of EINVAL.
Noticed-by: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/nfsctl.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 3d93b20..5a936c1 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -938,6 +938,8 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
char transport[16];
int port;
if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
+ if (port < 1 || port > 65535)
+ return -EINVAL;
err = nfsd_create_serv();
if (!err) {
err = svc_create_xprt(nfsd_serv,
@@ -960,7 +962,7 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
char transport[16];
int port;
if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
- if (port == 0)
+ if (port < 1 || port > 65535)
return -EINVAL;
if (nfsd_serv) {
xprt = svc_find_xprt(nfsd_serv, transport,
--
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