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authorAl Viro <viro@zeniv.linux.org.uk>2009-11-30 20:12:03 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-11 06:44:57 -0500
commit8c7b49b3ecd48923eb64ff57e07a1cdb74782970 (patch)
tree3bb2335ccaa34ef227459800c2221e71cf6b1987 /mm/util.c
parentf8b7256096a20436f6d0926747e3ac3d64c81d24 (diff)
downloadlinux-8c7b49b3ecd48923eb64ff57e07a1cdb74782970.tar.gz
fix a struct file leak in do_mmap_pgoff()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index 3bf81b294ae..b377ce43080 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -280,9 +280,24 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
unsigned long retval = -EBADF;
if (!(flags & MAP_ANONYMOUS)) {
+ if (unlikely(flags & MAP_HUGETLB))
+ return -EINVAL;
file = fget(fd);
if (!file)
goto out;
+ } else if (flags & MAP_HUGETLB) {
+ struct user_struct *user = NULL;
+ /*
+ * VM_NORESERVE is used because the reservations will be
+ * taken when vm_ops->mmap() is called
+ * A dummy user value is used because we are not locking
+ * memory so no accounting is necessary
+ */
+ len = ALIGN(len, huge_page_size(&default_hstate));
+ file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE,
+ &user, HUGETLB_ANONHUGE_INODE);
+ if (IS_ERR(file))
+ return PTR_ERR(file);
}
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);