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author | Stefano Stabellini <sstabellini@kernel.org> | 2017-11-16 00:20:21 +0300 |
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committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-11-16 00:38:15 +0300 |
commit | 646d944c2ef5a3b298c4e150494c71b9272d8b47 (patch) | |
tree | 7dc5ca8c8681c80b438db0babfebe26e2f1ecbc0 /include/xen/xen-ops.h | |
parent | 24e7f84db0db6b6f14581707a45d06ec5d5b88f2 (diff) | |
download | linux-646d944c2ef5a3b298c4e150494c71b9272d8b47.tar.xz |
xen/pvcalls: fix potential endless loop in pvcalls-front.c
mutex_trylock() returns 1 if you take the lock and 0 if not. Assume you
take in_mutex on the first try, but you can't take out_mutex. Next times
you call mutex_trylock() in_mutex is going to fail. It's an endless
loop.
Solve the problem by waiting until the global refcount is 1 instead (the
refcount is 1 when the only active pvcalls frontend function is
pvcalls_front_release).
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'include/xen/xen-ops.h')
0 files changed, 0 insertions, 0 deletions