Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: batman-adv: fix error handling Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was in wrong error handling in batadv_mesh_init(). Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case of any batadv_*_init() calls failure. This approach may work well, when there is some kind of indicator, which can tell which parts of batadv are initialized; but there isn't any. All written above lead to cleaning up uninitialized fields. Even if we hide ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1] To fix these bugs we can unwind batadv_*_init() calls one by one. It is good approach for 2 reasons: 1) It fixes bugs on error handling path 2) It improves the performance, since we won't call unneeded batadv_*_free() functions. So, this patch makes all batadv_*_init() clean up all allocated memory before returning with an error to no call correspoing batadv_*_free() and open-codes batadv_mesh_free() with proper order to avoid touching uninitialized fields.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 0c6b199f09be489c48622537a550787fc80aea73; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before e50f957652190b5a88a8ebce7e5ab14ebd0d3f00; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before fbf150b16a3635634b7dfb7f229d8fcd643c6c51; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 6422e8471890273994fe8cc6d452b0dcd2c9483e; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before b0a2cd38553c77928ef1646ed1518486b1e70ae8; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before a8f7359259dd5923adc6129284fdad12fc5db347; affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 before 6f68cd634856f8ca93bafd623ba5357e0f648c68 |
| Linux / Linux | affected 2.6.38; unaffected 0 before 2.6.38; unaffected 4.4.293 through 4.4.*; unaffected 4.9.289 through 4.9.*; unaffected 4.14.254 through 4.14.*; unaffected 4.19.215 through 4.19.*; unaffected 5.4.157 through 5.4.*; unaffected 5.10.77 through 5.10.*; unaffected 5.14.16 through 5.14.*; unaffected 5.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73
- https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20
- https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00
- https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51
- https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e
- https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8
- https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347
- https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73
- https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20
- https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00
- https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51
- https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e
- https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8
- https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347
- https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68