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fs/ntfs3: Fix attr_punch_hole() null pointer derenference

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commit 6d5c9e79b7 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@gmail.com>
Co-developed-by: Tal Lossos <tallossos@gmail.com>
Signed-off-by: Tal Lossos <tallossos@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alon Zahavi 2022-08-15 14:07:12 +03:00 committed by Greg Kroah-Hartman
parent d4d112e5c4
commit 9cca110cf8
1 changed files with 1 additions and 1 deletions
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2
fs/ntfs3/attrib.c
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@ -1967,7 +1967,7 @@ int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size)
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)