proc: fix -ESRCH error when writing to /proc/$pid/coredump_filter
Writing to /proc/$pid/coredump_filter always returns -ESRCH because commit 774636e1 ("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: 774636e1 ("proc: convert to kstrto*()/kstrto*_from_user()") Signed-off-by: NColin Ian King <colin.king@canonical.com> Acked-by: NKees Cook <keescook@chromium.org> Cc: <stable@vger.kernel.org> [4.3+] Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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