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authorSudeep Dutt <sudeep.dutt@intel.com>2014-02-03 14:53:19 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-07 15:30:34 -0800
commit3b1cc9b9622a022208ec95b1259b05bbdf712eb7 (patch)
treec80a0f6b893b3bb48b70b23c13f5258ba06a8d82 /Documentation
parent01ab1167cd2d861d20195eda08505652c536df97 (diff)
misc: mic: fix possible signed underflow (undefined behavior) in userspace API
iovcnt is declared as a signed integer in both the userspace API and as a local variable in mic_virtio.c. The while() loop in mic_virtio.c iterates until the local variable iovcnt reaches the value 0. If userspace passes e.g. INT_MIN as iovcnt field, this loop then appears to depend on an undefined behavior (signed underflow) to complete. The fix is to use unsigned integers in both the userspace API and the local variable. This issue was reported @ https://lkml.org/lkml/2014/1/10/10 Reported-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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