https://github.com/torvalds/linux
Revision b13d14339baaaa720e7e5448855f33ba501917aa authored by Jann Horn on 30 October 2016, 22:19:24 UTC, committed by Greg Kroah-Hartman on 10 November 2016, 14:24:02 UTC
free_pardevice() is called by parport_unregister_device() and already frees pp->pdev->name, don't try to do it again. This bug causes kernel crashes. I found and verified this with KASAN and some added pr_emerg()s: [ 60.316568] pp_release: pp->pdev->name == ffff88039cb264c0 [ 60.316692] free_pardevice: freeing par_dev->name at ffff88039cb264c0 [ 60.316706] pp_release: kfree(ffff88039cb264c0) [ 60.316714] ========================================================== [ 60.316722] BUG: Double free or freeing an invalid pointer [ 60.316731] Unexpected shadow byte: 0xFB [ 60.316801] Object at ffff88039cb264c0, in cache kmalloc-32 size: 32 [ 60.316813] Allocated: [ 60.316824] PID = 1695 [ 60.316869] Freed: [ 60.316880] PID = 1695 [ 60.316935] ========================================================== Signed-off-by: Jann Horn <jann@thejh.net> Acked-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent f6b2db0
Tip revision: b13d14339baaaa720e7e5448855f33ba501917aa authored by Jann Horn on 30 October 2016, 22:19:24 UTC
ppdev: fix double-free of pp->pdev->name
ppdev: fix double-free of pp->pdev->name
Tip revision: b13d143
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