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| author | Li Zetao <lizetao1@huawei.com> | 2024-03-04 11:22:03 +0800 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-03-10 15:09:59 -0400 |
| commit | f8cdf65b51f036d77edece8a175447dd41be63ca (patch) | |
| tree | 585dd00840ba676c0efd57dc712af2816c240170 /fs/bcachefs/super.c | |
| parent | d206a76d7d2726f3b096037f2079ce0bd3ba329b (diff) | |
| download | linux-f8cdf65b51f036d77edece8a175447dd41be63ca.tar.gz linux-f8cdf65b51f036d77edece8a175447dd41be63ca.tar.bz2 linux-f8cdf65b51f036d77edece8a175447dd41be63ca.zip | |
bcachefs: Fix null-ptr-deref in bch2_fs_alloc()
There is a null-ptr-deref issue reported by kasan:
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Call Trace:
<TASK>
bch2_fs_alloc+0x1092/0x2170 [bcachefs]
bch2_fs_open+0x683/0xe10 [bcachefs]
...
When initializing the name of bch_fs, it needs to dynamically alloc memory
to meet the length of the name. However, when name allocation failed, it
will cause a null-ptr-deref access exception in subsequent string copy.
Fix this issue by checking if name allocation is successful.
Fixes: 401ec4db6308 ("bcachefs: Printbuf rework")
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/super.c')
| -rw-r--r-- | fs/bcachefs/super.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c index 6b23e11825e6..24fa41bbe7e3 100644 --- a/fs/bcachefs/super.c +++ b/fs/bcachefs/super.c @@ -818,13 +818,13 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts) goto err; pr_uuid(&name, c->sb.user_uuid.b); - strscpy(c->name, name.buf, sizeof(c->name)); - printbuf_exit(&name); - ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0; if (ret) goto err; + strscpy(c->name, name.buf, sizeof(c->name)); + printbuf_exit(&name); + /* Compat: */ if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 && !BCH_SB_JOURNAL_FLUSH_DELAY(sb)) |