Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix slab-use-after-free due to dangling pointer dqi_priv When mounting ocfs2 and then remounting it as read-only, a slab-use-after-free occurs after the user uses a syscall to quota_getnextquota. Specifically, sb_dqinfo(sb, type)->dqi_priv is the dangling pointer. During the remounting process, the pointer dqi_priv is freed but is never set as null leaving it to be accessed. Additionally, the read-only option for remounting sets the DQUOT_SUSPENDED flag instead of setting the DQUOT_USAGE_ENABLED flags. Moreover, later in the process of getting the next quota, the function ocfs2_get_next_id is called and only checks the quota usage flags and not the quota suspended flags. To fix this, I set dqi_priv to null when it is freed after remounting with read-only and put a check for DQUOT_SUSPENDED in ocfs2_get_next_id. [akpm@linux-foundation.org: coding-style cleanups]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before 58f9e20e2a7602e1dd649a1ec4790077c251cb6c; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before 8ff6f635a08c30559ded0c110c7ce03ba7747d11; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before f44e6d70c100614c211703f065cad448050e4a0e; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before 2d431192486367eee03cc28d0b53b97dafcb8e63; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before 2e3d203b1adede46bbba049e497765d67865be18; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before ba950a02d8d23811aa1120affd3adedcfac6153d; affected 8f9e8f5fcc059a3cba87ce837c88316797ef3645 before 5f3fd772d152229d94602bca243fbb658068a597 |
| Linux / Linux | affected 4.6; unaffected 0 before 4.6; unaffected 5.4.290 through 5.4.*; unaffected 5.10.234 through 5.10.*; unaffected 5.15.177 through 5.15.*; unaffected 6.1.125 through 6.1.*; unaffected 6.6.70 through 6.6.*; unaffected 6.12.9 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/58f9e20e2a7602e1dd649a1ec4790077c251cb6c
- https://git.kernel.org/stable/c/8ff6f635a08c30559ded0c110c7ce03ba7747d11
- https://git.kernel.org/stable/c/f44e6d70c100614c211703f065cad448050e4a0e
- https://git.kernel.org/stable/c/2d431192486367eee03cc28d0b53b97dafcb8e63
- https://git.kernel.org/stable/c/2e3d203b1adede46bbba049e497765d67865be18
- https://git.kernel.org/stable/c/ba950a02d8d23811aa1120affd3adedcfac6153d
- https://git.kernel.org/stable/c/5f3fd772d152229d94602bca243fbb658068a597
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.