hfsplus: Fix potential buffer overflows

commit 6f24f892871acc47b40dd594c63606a17c714f77 upstream.

Commit ec81aecb2966 ("hfs: fix a potential buffer overflow") fixed a few
potential buffer overflows in the hfs filesystem.  But as Timo Warns
pointed out, these changes also need to be made on the hfsplus
filesystem as well.

Reported-by: Timo Warns <warns@pre-sense.de>
Acked-by: WANG Cong <amwang@redhat.com>
Cc: Alexey Khoroshilov <khoroshilov@ispras.ru>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Cc: Sage Weil <sage@newdream.net>
Cc: Eugene Teo <eteo@redhat.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Dave Anderson <anderson@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/fs/hfsplus/catalog.c b/fs/hfsplus/catalog.c
index 4dfbfec..ec2a9c2 100644 (file)
--- a/fs/hfsplus/catalog.c
+++ b/fs/hfsplus/catalog.c
@@ -366,6 +366,10 @@ int hfsplus_rename_cat(u32 cnid,
        err = hfs_brec_find(&src_fd);
        if (err)
                goto out;
+       if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
+               err = -EIO;
+               goto out;
+       }
 
        hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
                                src_fd.entrylength);

diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 4536cd3..5adb740 100644 (file)
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -150,6 +150,11 @@ static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
                filp->f_pos++;
                /* fall through */
        case 1:
+               if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
+                       err = -EIO;
+                       goto out;
+               }
+
                hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
                        fd.entrylength);
                if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
@@ -181,6 +186,12 @@ static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
                        err = -EIO;
                        goto out;
                }
+
+               if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
+                       err = -EIO;
+                       goto out;
+               }
+
                hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
                        fd.entrylength);
                type = be16_to_cpu(entry.type);