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Commit f33ff992 authored by Al Viro's avatar Al Viro
Browse files

take rlimit check to callers of expand_files() 



... except for one in android, where the check is different
and already done in caller.  No need to recalculate rlimit
many times in alloc_fd() either.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 352e3b24

fs/fcntl.c

+3 −0
Original line number Diff line number Diff line
@@ -64,6 +64,9 @@ SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags) 
	if (unlikely(oldfd == newfd))

		return -EINVAL;



	if (newfd >= rlimit(RLIMIT_NOFILE))

		return -EMFILE;



	spin_lock(&files->file_lock);

	err = expand_files(files, newfd);

	file = fcheck(oldfd);

fs/file.c

+9 −7
Original line number Diff line number Diff line
@@ -251,13 +251,6 @@ int expand_files(struct files_struct *files, int nr) 


	fdt = files_fdtable(files);



	/*

	 * N.B. For clone tasks sharing a files structure, this test

	 * will limit the total number of files that can be opened.

	 */

	if (nr >= rlimit(RLIMIT_NOFILE))

		return -EMFILE;



	/* Do we need to expand? */

	if (nr < fdt->max_fds)

		return 0;
@@ -431,6 +424,7 @@ int alloc_fd(unsigned start, unsigned flags) 
{

	struct files_struct *files = current->files;

	unsigned int fd;

	unsigned end = rlimit(RLIMIT_NOFILE);

	int error;

	struct fdtable *fdt;
@@ -444,6 +438,14 @@ int alloc_fd(unsigned start, unsigned flags) 
	if (fd < fdt->max_fds)

		fd = find_next_zero_bit(fdt->open_fds, fdt->max_fds, fd);



	/*

	 * N.B. For clone tasks sharing a files structure, this test

	 * will limit the total number of files that can be opened.

	 */

	error = -EMFILE;

	if (fd >= end)

		goto out;



	error = expand_files(files, fd);

	if (error < 0)

		goto out;