Commit 6e3e37a5 authored Mar 10, 2010 by André Goddard Rosa Committed by Linus Torvalds Mar 12, 2010

coredump: plug a memory leak situation on dump_seek()

After having started writing the coredump, if filesystem reports an error
anytime while writing part of the core file, we would leak a memory page
when bailing out.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Roland McGrath <roland@redhat.com>
Cc: WANG Cong <amwang@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 5cacdb4a

include/linux/coredump.h

+7 −3

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@ static inline int dump_write(struct file file, const void addr, int nr)

		static inline int dump_seek(struct file *file, loff_t off)
		{
		int ret = 1;

		if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
		if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
		return 0;
		@@ -29,13 +31,15 @@ static inline int dump_seek(struct file *file, loff_t off)

		if (n > PAGE_SIZE)
		n = PAGE_SIZE;
		if (!dump_write(file, buf, n))
		return 0;
		if (!dump_write(file, buf, n)) {
		ret = 0;
		break;
		}
		off -= n;
		}
		free_page((unsigned long)buf);
		}
		return 1;
		return ret;
		}

		#endif /* _LINUX_COREDUMP_H */