Commit d95a5620 authored by Remi Pommarel's avatar Remi Pommarel Committed by Jakub Kicinski

net: bridge: fix ioctl old_deviceless bridge argument

Commit 561d8352 ("bridge: use ndo_siocdevprivate") changed the
source and destination arguments of copy_{to,from}_user in bridge's
old_deviceless() from args[1] to uarg breaking SIOC{G,S}IFBR ioctls.

Commit cbd7ad29 ("net: bridge: fix ioctl old_deviceless bridge
argument") fixed only BRCTL_{ADD,DEL}_BRIDGES commands leaving
BRCTL_GET_BRIDGES one untouched.

The fixes BRCTL_GET_BRIDGES as well and has been tested with busybox's
brctl.

Example of broken brctl:
$ brctl show
bridge name     bridge id               STP enabled     interfaces
brctl: can't get bridge name for index 0: No such device or address

Example of fixed brctl:
$ brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.000000000000       no

Fixes: 561d8352 ("bridge: use ndo_siocdevprivate")
Signed-off-by: default avatarRemi Pommarel <repk@triplefau.lt>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarNikolay Aleksandrov <nikolay@nvidia.com>
Link: https://lore.kernel.org/all/20211223153139.7661-2-repk@triplefau.lt/Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent eccffcf4
...@@ -337,7 +337,7 @@ static int old_deviceless(struct net *net, void __user *uarg) ...@@ -337,7 +337,7 @@ static int old_deviceless(struct net *net, void __user *uarg)
args[2] = get_bridge_ifindices(net, indices, args[2]); args[2] = get_bridge_ifindices(net, indices, args[2]);
ret = copy_to_user(uarg, indices, ret = copy_to_user((void __user *)args[1], indices,
array_size(args[2], sizeof(int))) array_size(args[2], sizeof(int)))
? -EFAULT : args[2]; ? -EFAULT : args[2];
......
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