From: Duoming Zhou duoming@zju.edu.cn
commit 87563a043cef044fed5db7967a75741cc16ad2b1 upstream.
The previous commit d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs") introduces refcount into ax25_dev, but there are reference leak paths in ax25_ctl_ioctl(), ax25_fwd_ioctl(), ax25_rt_add(), ax25_rt_del() and ax25_rt_opt().
This patch uses ax25_dev_put() and adjusts the position of ax25_addr_ax25dev() to fix reference cout leaks of ax25_dev.
Fixes: d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs") Signed-off-by: Duoming Zhou duoming@zju.edu.cn Reviewed-by: Dan Carpenter dan.carpenter@oracle.com Link: https://lore.kernel.org/r/20220203150811.42256-1-duoming@zju.edu.cn Signed-off-by: Jakub Kicinski kuba@kernel.org [OP: backport to 4.19: adjust context] Signed-off-by: Ovidiu Panait ovidiu.panait@windriver.com --- include/net/ax25.h | 8 +++++--- net/ax25/af_ax25.c | 12 ++++++++---- net/ax25/ax25_dev.c | 24 +++++++++++++++++------- net/ax25/ax25_route.c | 16 +++++++++++----- 4 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/include/net/ax25.h b/include/net/ax25.h index d81bfb674906..aadff553e4b7 100644 --- a/include/net/ax25.h +++ b/include/net/ax25.h @@ -291,10 +291,12 @@ static __inline__ void ax25_cb_put(ax25_cb *ax25) } }
-#define ax25_dev_hold(__ax25_dev) \ - refcount_inc(&((__ax25_dev)->refcount)) +static inline void ax25_dev_hold(ax25_dev *ax25_dev) +{ + refcount_inc(&ax25_dev->refcount); +}
-static __inline__ void ax25_dev_put(ax25_dev *ax25_dev) +static inline void ax25_dev_put(ax25_dev *ax25_dev) { if (refcount_dec_and_test(&ax25_dev->refcount)) { kfree(ax25_dev); diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index 56776e2997a5..f605549fd25a 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -369,21 +369,25 @@ static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg) if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl))) return -EFAULT;
- if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL) - return -ENODEV; - if (ax25_ctl.digi_count > AX25_MAX_DIGIS) return -EINVAL;
if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL) return -EINVAL;
+ ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr); + if (!ax25_dev) + return -ENODEV; + digi.ndigi = ax25_ctl.digi_count; for (k = 0; k < digi.ndigi; k++) digi.calls[k] = ax25_ctl.digi_addr[k];
- if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL) + ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev); + if (!ax25) { + ax25_dev_put(ax25_dev); return -ENOTCONN; + }
switch (ax25_ctl.cmd) { case AX25_KILL: diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c index 76d105390706..55a611f7239b 100644 --- a/net/ax25/ax25_dev.c +++ b/net/ax25/ax25_dev.c @@ -88,8 +88,8 @@ void ax25_dev_device_up(struct net_device *dev) spin_lock_bh(&ax25_dev_lock); ax25_dev->next = ax25_dev_list; ax25_dev_list = ax25_dev; - ax25_dev_hold(ax25_dev); spin_unlock_bh(&ax25_dev_lock); + ax25_dev_hold(ax25_dev);
ax25_register_dev_sysctl(ax25_dev); } @@ -118,8 +118,8 @@ void ax25_dev_device_down(struct net_device *dev)
if ((s = ax25_dev_list) == ax25_dev) { ax25_dev_list = s->next; - ax25_dev_put(ax25_dev); spin_unlock_bh(&ax25_dev_lock); + ax25_dev_put(ax25_dev); dev->ax25_ptr = NULL; dev_put(dev); ax25_dev_put(ax25_dev); @@ -129,8 +129,8 @@ void ax25_dev_device_down(struct net_device *dev) while (s != NULL && s->next != NULL) { if (s->next == ax25_dev) { s->next = ax25_dev->next; - ax25_dev_put(ax25_dev); spin_unlock_bh(&ax25_dev_lock); + ax25_dev_put(ax25_dev); dev->ax25_ptr = NULL; dev_put(dev); ax25_dev_put(ax25_dev); @@ -153,25 +153,35 @@ int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
switch (cmd) { case SIOCAX25ADDFWD: - if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) + fwd_dev = ax25_addr_ax25dev(&fwd->port_to); + if (!fwd_dev) { + ax25_dev_put(ax25_dev); return -EINVAL; - if (ax25_dev->forward != NULL) + } + if (ax25_dev->forward) { + ax25_dev_put(fwd_dev); + ax25_dev_put(ax25_dev); return -EINVAL; + } ax25_dev->forward = fwd_dev->dev; ax25_dev_put(fwd_dev); + ax25_dev_put(ax25_dev); break;
case SIOCAX25DELFWD: - if (ax25_dev->forward == NULL) + if (!ax25_dev->forward) { + ax25_dev_put(ax25_dev); return -EINVAL; + } ax25_dev->forward = NULL; + ax25_dev_put(ax25_dev); break;
default: + ax25_dev_put(ax25_dev); return -EINVAL; }
- ax25_dev_put(ax25_dev); return 0; }
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c index cd380767245c..8f81de88f006 100644 --- a/net/ax25/ax25_route.c +++ b/net/ax25/ax25_route.c @@ -78,11 +78,13 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route) ax25_dev *ax25_dev; int i;
- if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) - return -EINVAL; if (route->digi_count > AX25_MAX_DIGIS) return -EINVAL;
+ ax25_dev = ax25_addr_ax25dev(&route->port_addr); + if (!ax25_dev) + return -EINVAL; + write_lock_bh(&ax25_route_lock);
ax25_rt = ax25_route_list; @@ -94,6 +96,7 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route) if (route->digi_count != 0) { if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev); return -ENOMEM; } ax25_rt->digipeat->lastrepeat = -1; @@ -104,6 +107,7 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route) } } write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev); return 0; } ax25_rt = ax25_rt->next; @@ -111,6 +115,7 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev); return -ENOMEM; }
@@ -119,11 +124,11 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route) ax25_rt->dev = ax25_dev->dev; ax25_rt->digipeat = NULL; ax25_rt->ip_mode = ' '; - ax25_dev_put(ax25_dev); if (route->digi_count != 0) { if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { write_unlock_bh(&ax25_route_lock); kfree(ax25_rt); + ax25_dev_put(ax25_dev); return -ENOMEM; } ax25_rt->digipeat->lastrepeat = -1; @@ -136,6 +141,7 @@ static int __must_check ax25_rt_add(struct ax25_routes_struct *route) ax25_rt->next = ax25_route_list; ax25_route_list = ax25_rt; write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev);
return 0; } @@ -176,8 +182,8 @@ static int ax25_rt_del(struct ax25_routes_struct *route) } } } - ax25_dev_put(ax25_dev); write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev);
return 0; } @@ -219,8 +225,8 @@ static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) }
out: - ax25_dev_put(ax25_dev); write_unlock_bh(&ax25_route_lock); + ax25_dev_put(ax25_dev); return err; }