Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mm: fix NULL pointer dereference in alloc_pages_bulk_noprof We triggered a NULL pointer dereference for ac.preferred_zoneref->zone in alloc_pages_bulk_noprof() when the task is migrated between cpusets. When cpuset is enabled, in prepare_alloc_pages(), ac->nodemask may be ¤t->mems_allowed. when first_zones_zonelist() is called to find preferred_zoneref, the ac->nodemask may be modified concurrently if the task is migrated between different cpusets. Assuming we have 2 NUMA Node, when traversing Node1 in ac->zonelist, the nodemask is 2, and when traversing Node2 in ac->zonelist, the nodemask is 1. As a result, the ac->preferred_zoneref points to NULL zone. In alloc_pages_bulk_noprof(), for_each_zone_zonelist_nodemask() finds a allowable zone and calls zonelist_node_idx(ac.preferred_zoneref), leading to NULL pointer dereference. __alloc_pages_noprof() fixes this issue by checking NULL pointer in commit ea57485af8f4 ("mm, page_alloc: fix check for NULL preferred_zone") and commit df76cee6bbeb ("mm, page_alloc: remove redundant checks from alloc fastpath"). To fix it, check NULL pointer for preferred_zoneref->zone.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 387ba26fb1cb9be9e35dc14a6d97188e916eda05 before 903d896448c2e50e8652aaba529a30d4d1eaa0e5; affected 387ba26fb1cb9be9e35dc14a6d97188e916eda05 before 6addb2d9501ec866d7b3a3b4e665307c437e9be2; affected 387ba26fb1cb9be9e35dc14a6d97188e916eda05 before d0f16cec79774c3132df006cf771eddd89d08f58; affected 387ba26fb1cb9be9e35dc14a6d97188e916eda05 before 31502374627ba9ec3e710dbd0bb00457cc6d2c19; affected 387ba26fb1cb9be9e35dc14a6d97188e916eda05 before 8ce41b0f9d77cca074df25afd39b86e2ee3aa68e |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.174 through 5.15.*; unaffected 6.1.119 through 6.1.*; unaffected 6.6.63 through 6.6.*; unaffected 6.11.10 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/903d896448c2e50e8652aaba529a30d4d1eaa0e5
- https://git.kernel.org/stable/c/6addb2d9501ec866d7b3a3b4e665307c437e9be2
- https://git.kernel.org/stable/c/d0f16cec79774c3132df006cf771eddd89d08f58
- https://git.kernel.org/stable/c/31502374627ba9ec3e710dbd0bb00457cc6d2c19
- https://git.kernel.org/stable/c/8ce41b0f9d77cca074df25afd39b86e2ee3aa68e
ADP enrichment
No English description supplied.