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| author | Alon Zahavi <zahavi.alon@gmail.com> | 2022-08-15 14:07:12 +0300 |
|---|---|---|
| committer | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2022-09-30 17:39:50 +0300 |
| commit | 6d5c9e79b726cc473d40e9cb60976dbe8e669624 (patch) | |
| tree | 06efd61e38ceda6eb669fe14c42ad7284c5f03ec /fs/ntfs3 | |
| parent | f27b92ec0926efa3eadcebb97a90faba12e16041 (diff) | |
| download | linux-6d5c9e79b726cc473d40e9cb60976dbe8e669624.tar.bz2 | |
fs/ntfs3: Fix attr_punch_hole() null pointer derenference
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>
Diffstat (limited to 'fs/ntfs3')
| -rw-r--r-- | fs/ntfs3/attrib.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c index 578c2bcfb1d9..63169529b52c 100644 --- a/fs/ntfs3/attrib.c +++ b/fs/ntfs3/attrib.c @@ -2038,7 +2038,7 @@ 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) |