linux-kernel - [PATCH] do_coredump: fix the "ispipe" error check

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Message-ID: <20110607183542.GA5559@redhat.com>
Date:	Tue, 7 Jun 2011 20:35:42 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Xiaotian Feng <dfeng@...hat.com>,
	Neil Horman <nhorman@...driver.com>
Subject: [PATCH] do_coredump: fix the "ispipe" error check

do_coredump() assumes that if format_corename() fails it should
return -ENOMEM. This is not true, for example cn_print_exe_file()
can propagate the error from d_path. Even if it was true, this is
too fragile. Change the code to check "ispipe < 0".

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 fs/exec.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- ptrace/fs/exec.c~corename_errcode	2011-06-07 19:44:30.000000000 +0200
+++ ptrace/fs/exec.c	2011-06-07 20:20:48.000000000 +0200
@@ -2092,16 +2092,16 @@ void do_coredump(long signr, int exit_co
 
 	ispipe = format_corename(&cn, signr);
 
-	if (ispipe == -ENOMEM) {
-		printk(KERN_WARNING "format_corename failed\n");
-		printk(KERN_WARNING "Aborting core\n");
-		goto fail_corename;
-	}
-
  	if (ispipe) {
 		int dump_count;
 		char **helper_argv;
 
+		if (ispipe < 0) {
+			printk(KERN_WARNING "format_corename failed\n");
+			printk(KERN_WARNING "Aborting core\n");
+			goto fail_corename;
+		}
+
 		if (cprm.limit == 1) {
 			/*
 			 * Normally core limits are irrelevant to pipes, since

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