Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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

lib/fault-inject.c

+5 −3
Original line number Diff line number Diff line
@@ -110,11 +110,13 @@ 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))

		if (fail_nth) {

			if (!WRITE_ONCE(current->fail_nth, fail_nth - 1))

				goto fail;



			return false;

		}

	}



	/* No need to check any other properties if the probability is 0 */

	if (attr->probability == 0)