[PATCH 5.15 100/117] fs/ntfs3: Fix attr_punch_hole() null pointer derenference

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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
@@ -1967,7 +1967,7 @@ 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)





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