CVE-2025-68220

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: ethernet: ti: netcp: Standardize knav_dma_open_channel to return NULL on error<br /> <br /> Make knav_dma_open_channel consistently return NULL on error instead<br /> of ERR_PTR. Currently the header include/linux/soc/ti/knav_dma.h<br /> returns NULL when the driver is disabled, but the driver<br /> implementation does not even return NULL or ERR_PTR on failure,<br /> causing inconsistency in the users. This results in a crash in<br /> netcp_free_navigator_resources as followed (trimmed):<br /> <br /> Unhandled fault: alignment exception (0x221) at 0xfffffff2<br /> [fffffff2] *pgd=80000800207003, *pmd=82ffda003, *pte=00000000<br /> Internal error: : 221 [#1] SMP ARM<br /> Modules linked in:<br /> CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc7 #1 NONE<br /> Hardware name: Keystone<br /> PC is at knav_dma_close_channel+0x30/0x19c<br /> LR is at netcp_free_navigator_resources+0x2c/0x28c<br /> <br /> [... TRIM...]<br /> <br /> Call trace:<br /> knav_dma_close_channel from netcp_free_navigator_resources+0x2c/0x28c<br /> netcp_free_navigator_resources from netcp_ndo_open+0x430/0x46c<br /> netcp_ndo_open from __dev_open+0x114/0x29c<br /> __dev_open from __dev_change_flags+0x190/0x208<br /> __dev_change_flags from netif_change_flags+0x1c/0x58<br /> netif_change_flags from dev_change_flags+0x38/0xa0<br /> dev_change_flags from ip_auto_config+0x2c4/0x11f0<br /> ip_auto_config from do_one_initcall+0x58/0x200<br /> do_one_initcall from kernel_init_freeable+0x1cc/0x238<br /> kernel_init_freeable from kernel_init+0x1c/0x12c<br /> kernel_init from ret_from_fork+0x14/0x38<br /> [... TRIM...]<br /> <br /> Standardize the error handling by making the function return NULL on<br /> all error conditions. The API is used in just the netcp_core.c so the<br /> impact is limited.<br /> <br /> Note, this change, in effect reverts commit 5b6cb43b4d62 ("net:<br /> ethernet: ti: netcp_core: return error while dma channel open issue"),<br /> but provides a less error prone implementation.