waitid(): Avoid unbalanced user_access_end() on access_ok() error
authorKees Cook <keescook@chromium.org>
Fri, 20 Oct 2017 14:36:05 +0000 (07:36 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 20 Oct 2017 19:32:54 +0000 (15:32 -0400)
commit1c9fec470b81ca5e89391c20a11ead31a1e9314b
tree9a63ad70ff0ae15e6809cc916dac18577b0c0285
parent9a27ded2195aaec2041ed2525ba7f373c60920c7
waitid(): Avoid unbalanced user_access_end() on access_ok() error

As pointed out by Linus and David, the earlier waitid() fix resulted in
a (currently harmless) unbalanced user_access_end() call.  This fixes it
to just directly return EFAULT on access_ok() failure.

Fixes: 96ca579a1ecc ("waitid(): Add missing access_ok() checks")
Acked-by: David Daney <david.daney@cavium.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/exit.c