proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter
authorColin Ian King <colin.king@canonical.com>
Fri, 18 Dec 2015 22:22:01 +0000 (14:22 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 18 Dec 2015 22:25:40 +0000 (14:25 -0800)
commit41a0c249cb8706a2efa1ab3d59466b23a27d0c8b
tree46e4739253a5199799a9f4b7daa634f4217f06ad
parent73796d8bf27372e26c2b79881947304c14c2d353
proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter

Writing to /proc/$pid/coredump_filter always returns -ESRCH because commit
774636e19ed51 ("proc: convert to kstrto*()/kstrto*_from_user()") removed
the setting of ret after the get_proc_task call and incorrectly left it as
-ESRCH.  Instead, return 0 when successful.

Example breakage:

  echo 0 > /proc/self/coredump_filter
  bash: echo: write error: No such process

Fixes: 774636e19ed51 ("proc: convert to kstrto*()/kstrto*_from_user()")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org> [4.3+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/base.c