https://github.com/torvalds/linux
Revision c171654caa875919be3c533d3518da8be5be966e authored by Shuah Khan (Samsung OSG) on 15 May 2018, 23:57:23 UTC, committed by Greg Kroah-Hartman on 16 May 2018, 16:52:13 UTC
stub_probe() calls put_busid_priv() in an error path when device isn't found in the busid_table. Fix it by making put_busid_priv() safe to be called with null struct bus_id_priv pointer. This problem happens when "usbip bind" is run without loading usbip_host driver and then running modprobe. The first failed bind attempt unbinds the device from the original driver and when usbip_host is modprobed, stub_probe() runs and doesn't find the device in its busid table and calls put_busid_priv(0 with null bus_id_priv pointer. usbip-host 3-10.2: 3-10.2 is not in match_busid table... skip! [ 367.359679] ===================================== [ 367.359681] WARNING: bad unlock balance detected! [ 367.359683] 4.17.0-rc4+ #5 Not tainted [ 367.359685] ------------------------------------- [ 367.359688] modprobe/2768 is trying to release lock ( [ 367.359689] ================================================================== [ 367.359696] BUG: KASAN: null-ptr-deref in print_unlock_imbalance_bug+0x99/0x110 [ 367.359699] Read of size 8 at addr 0000000000000058 by task modprobe/2768 [ 367.359705] CPU: 4 PID: 2768 Comm: modprobe Not tainted 4.17.0-rc4+ #5 Fixes: 22076557b07c ("usbip: usbip_host: fix NULL-ptr deref and use-after-free errors") in usb-linus Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent 2207655
Tip revision: c171654caa875919be3c533d3518da8be5be966e authored by Shuah Khan (Samsung OSG) on 15 May 2018, 23:57:23 UTC
usbip: usbip_host: fix bad unlock balance during stub_probe()
usbip: usbip_host: fix bad unlock balance during stub_probe()
Tip revision: c171654
File | Mode | Size |
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