From: Alon Zahavi <zahavi.alon@xxxxxxxxx>
commit 6d5c9e79b726cc473d40e9cb60976dbe8e669624 upstream.
The bug occours due to a misuse of `attr` variable instead of `attr_b`.
`attr` is being initialized as NULL, then being derenfernced
as `attr->res.data_size`.
This bug causes a crash of the ntfs3 driver itself,
If compiled directly to the kernel, it crashes the whole system.
Signed-off-by: Alon Zahavi <zahavi.alon@xxxxxxxxx>
Co-developed-by: Tal Lossos <tallossos@xxxxxxxxx>
Signed-off-by: Tal Lossos <tallossos@xxxxxxxxx>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ntfs3/attrib.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -2038,7 +2038,7 @@ int attr_punch_hole(struct ntfs_inode *n
return -ENOENT;
if (!attr_b->non_res) {
- u32 data_size = le32_to_cpu(attr->res.data_size);
+ u32 data_size = le32_to_cpu(attr_b->res.data_size);
u32 from, to;
if (vbo > data_size)
