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| author | Alon Zahavi <zahavi.alon@gmail.com> | 2022-08-15 14:07:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-24 07:24:41 +0100 |
| commit | ff3b1a624380c14b81f4e51c48e404a45f047aab (patch) | |
| tree | cee9937d7ab4ffb8f4354fdcb6a609633a00bf99 | |
| parent | b542cb024a5d981b4385e03bdeeaabcdd725c9f3 (diff) | |
| download | linux-ff3b1a624380c14b81f4e51c48e404a45f047aab.tar.gz | |
fs/ntfs3: Fix attr_punch_hole() null pointer derenference
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@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>
| -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) |