coredump: '% at the end' shouldn't bypass core_uses_pid logic

"goto end" should not bypass the "Backward compatibility with
core_uses_pid" code, move this label up.

While at it,

	- It is ugly to copy '|' into cn->corename and then inc
	  the pointer for argv_split().

	  Change format_corename() to increment pat_ptr instead.

	- Remove the dead "if (*pat_ptr == 0)" in format_corename(),
	  we already checked it is not zero.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Colin Walters <walters@verbum.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Cc: Lucas De Marchi <lucas.de.marchi@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/coredump.c b/fs/coredump.c
index 56a9ab963a40d675f49926bc01679509ffc488ec..72f816d6cad99d4d1f81433e928d42e540295188 100644 (file)
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -165,13 +165,15 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
        cn->corename = NULL;
        if (expand_corename(cn, core_name_size))
                return -ENOMEM;
+       cn->corename[0] = '\0';
+
+       if (ispipe)
+               ++pat_ptr;
 
        /* Repeat as long as we have more pattern to process and more output
           space */
        while (*pat_ptr) {
                if (*pat_ptr != '%') {
-                       if (*pat_ptr == 0)
-                               goto out;
                        err = cn_printf(cn, "%c", *pat_ptr++);
                } else {
                        switch (*++pat_ptr) {
@@ -240,6 +242,7 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
                        return err;
        }
 
+out:
        /* Backward compatibility with core_uses_pid:
         *
         * If core_pattern does not include a %p (as is the default)
@@ -250,7 +253,6 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
                if (err)
                        return err;
        }
-out:
        return ispipe;
 }
 
@@ -580,7 +582,7 @@ void do_coredump(siginfo_t *siginfo)
                        goto fail_dropcount;
                }
 
-               helper_argv = argv_split(GFP_KERNEL, cn.corename+1, NULL);
+               helper_argv = argv_split(GFP_KERNEL, cn.corename, NULL);
                if (!helper_argv) {
                        printk(KERN_WARNING "%s failed to allocate memory\n",
                               __func__);
@@ -597,7 +599,7 @@ void do_coredump(siginfo_t *siginfo)
 
                argv_free(helper_argv);
                if (retval) {
-                       printk(KERN_INFO "Core dump to %s pipe failed\n",
+                       printk(KERN_INFO "Core dump to |%s pipe failed\n",
                               cn.corename);
                        goto close_fail;
                }