ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: Fix panic about slab-out-of-bounds caused by ntfs_listxattr() Here is a BUG report from syzbot: BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline] BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710 Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632 Call Trace: ntfs_list_ea fs/ntfs3/xattr.c:191 [inline] ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710 vfs_listxattr fs/xattr.c:457 [inline] listxattr+0x293/0x2d0 fs/xattr.c:804 Fix the logic of ea_all iteration. When the ea->name_len is 0, return immediately, or Add2Ptr() would visit invalid memory in the next loop. [almaz.alexandrovich@paragon-software.com: lines of the patch have changed]

References

• https://git.kernel.org/stable/c/f3380d895e28a32632eb3609f5bd515adee4e5a1
• https://git.kernel.org/stable/c/c86a2517df6c9304db8fb12b77136ec7a5d85994
• https://git.kernel.org/stable/c/721b75ea2dfce53a8890dff92ae01afca8e74f88
• https://git.kernel.org/stable/c/3c675ddffb17a8b1e32efad5c983254af18b12c2