tree 494951a23a0a3a22bccecb1de3ae460ee31cc1c0
parent 8cfbb04fae75260eae07ab8c74c1dcd44294d739
author Marco Elver <elver@google.com> 1580897659 +0100
committer Ingo Molnar <mingo@kernel.org> 1584780162 +0100

kcsan: Fix 0-sized checks

Instrumentation of arbitrary memory-copy functions, such as user-copies,
may be called with size of 0, which could lead to false positives.

To avoid this, add a comparison in check_access() for size==0, which
will be optimized out for constant sized instrumentation
(__tsan_{read,write}N), and therefore not affect the common-case
fast-path.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>