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Commit d5bf4c4f authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

coredump: cleanup "ispipe" code 



- kill "int dump_count", argv_split(argcp) accepts argcp == NULL.

- move "int dump_count" under " if (ispipe)" branch, fail_dropcount
  can check ispipe.

- move "char **helper_argv" as well, change the code to do argv_free()
  right after call_usermodehelper_fns().

- If call_usermodehelper_fns() fails goto close_fail label instead
  of closing the file by hand.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c7135411

fs/exec.c

+17 −22
Original line number Diff line number Diff line
@@ -1841,10 +1841,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) 
	struct cred *cred;

	int retval = 0;

	int flag = 0;

	int ispipe = 0;

	char **helper_argv = NULL;

	int helper_argc = 0;

	int dump_count = 0;

	int ispipe;

	static atomic_t core_dump_count = ATOMIC_INIT(0);

	struct coredump_params cprm = {

		.signr = signr,
@@ -1914,6 +1911,9 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) 
	unlock_kernel();



 	if (ispipe) {

		int dump_count;

		char **helper_argv;



		if (cprm.limit == 1) {

			/*

			 * Normally core limits are irrelevant to pipes, since
@@ -1935,6 +1935,7 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) 
			printk(KERN_WARNING "Aborting core\n");

			goto fail_unlock;

		}

		cprm.limit = RLIM_INFINITY;



		dump_count = atomic_inc_return(&core_dump_count);

		if (core_pipe_limit && (core_pipe_limit < dump_count)) {
@@ -1944,26 +1945,21 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) 
			goto fail_dropcount;

		}



		helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);

		helper_argv = argv_split(GFP_KERNEL, corename+1, NULL);

		if (!helper_argv) {

			printk(KERN_WARNING "%s failed to allocate memory\n",

			       __func__);

			goto fail_dropcount;

		}



		cprm.limit = RLIM_INFINITY;



		/* SIGPIPE can happen, but it's just never processed */

		cprm.file = NULL;

		if (call_usermodehelper_fns(helper_argv[0], helper_argv, NULL,

					    UMH_WAIT_EXEC, umh_pipe_setup,

					    NULL, &cprm)) {

			if (cprm.file)

				filp_close(cprm.file, NULL);



		retval = call_usermodehelper_fns(helper_argv[0], helper_argv,

					NULL, UMH_WAIT_EXEC, umh_pipe_setup,

					NULL, &cprm);

		argv_free(helper_argv);

		if (retval) {

 			printk(KERN_INFO "Core dump to %s pipe failed\n",

			       corename);

			goto fail_dropcount;

			goto close_fail;

 		}

	} else {

		struct inode *inode;
@@ -2003,17 +1999,16 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs) 
	retval = binfmt->core_dump(&cprm);

	if (retval)

		current->signal->group_exit_code |= 0x80;

close_fail:



	if (ispipe && core_pipe_limit)

		wait_for_dump_helpers(cprm.file);

close_fail:

	if (cprm.file)

		filp_close(cprm.file, NULL);

fail_dropcount:

	if (dump_count)

	if (ispipe)

		atomic_dec(&core_dump_count);

fail_unlock:

	if (helper_argv)

		argv_free(helper_argv);



	revert_creds(old_cred);

	put_cred(cred);

	coredump_finish(mm);