Commit 9eeb52ae authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds

fault-inject: fix wrong should_fail() decision in task context

Commit 1203c8e6 ("fault-inject: simplify access check for fail-nth")
unintentionally broke a conditional statement in should_fail().  Any
faults are not injected in the task context by the change when the
systematic fault injection is not used.

This change restores to the previous correct behaviour.

Link: http://lkml.kernel.org/r/1501633700-3488-1-git-send-email-akinobu.mita@gmail.com
Fixes: 1203c8e6 ("fault-inject: simplify access check for fail-nth")
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Reported-by: default avatarLu Fengqi <lufq.fnst@cn.fujitsu.com>
Tested-by: default avatarLu Fengqi <lufq.fnst@cn.fujitsu.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4e98ebe5
......@@ -110,10 +110,12 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
if (in_task()) {
unsigned int fail_nth = READ_ONCE(current->fail_nth);
if (fail_nth && !WRITE_ONCE(current->fail_nth, fail_nth - 1))
goto fail;
if (fail_nth) {
if (!WRITE_ONCE(current->fail_nth, fail_nth - 1))
goto fail;
return false;
return false;
}
}
/* No need to check any other properties if the probability is 0 */
......
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