Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0b1b71370458860579831e77485883fcf2e8fbbe before 2fcccca88456b592bd668db13aa1d29ed257ca2b; affected 0b1b71370458860579831e77485883fcf2e8fbbe before 80165ff16051448d6f840585ebe13f2400415df3; affected 0b1b71370458860579831e77485883fcf2e8fbbe before b97415c4362f739e25ec6f71012277086fabdf6f; affected 0b1b71370458860579831e77485883fcf2e8fbbe before 4acc40db06ffd0fd92683505342b00c8a7394c60; affected 0b1b71370458860579831e77485883fcf2e8fbbe before 155eb99aff2920153bf21217ae29565fff81e6af; affected 0b1b71370458860579831e77485883fcf2e8fbbe before ed48a84a72fefb20a82dd90a7caa7807e90c6f66 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.200 through 5.15.*; unaffected 6.1.163 through 6.1.*; unaffected 6.6.124 through 6.6.*; unaffected 6.12.70 through 6.12.*; unaffected 6.18.10 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2b
- https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3
- https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6f
- https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60
- https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af
- https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66