CVE - CVE-2024-50296

CVE-ID
CVE-2024-50296	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix kernel crash when uninstalling driver When the driver is uninstalled and the VF is disabled concurrently, a kernel crash occurs. The reason is that the two actions call function pci_disable_sriov(). The num_VFs is checked to determine whether to release the corresponding resources. During the second calling, num_VFs is not 0 and the resource release function is called. However, the corresponding resource has been released during the first invoking. Therefore, the problem occurs: [15277.839633][T50670] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ... [15278.131557][T50670] Call trace: [15278.134686][T50670] klist_put+0x28/0x12c [15278.138682][T50670] klist_del+0x14/0x20 [15278.142592][T50670] device_del+0xbc/0x3c0 [15278.146676][T50670] pci_remove_bus_device+0x84/0x120 [15278.151714][T50670] pci_stop_and_remove_bus_device+0x6c/0x80 [15278.157447][T50670] pci_iov_remove_virtfn+0xb4/0x12c [15278.162485][T50670] sriov_disable+0x50/0x11c [15278.166829][T50670] pci_disable_sriov+0x24/0x30 [15278.171433][T50670] hnae3_unregister_ae_algo_prepare+0x60/0x90 [hnae3] [15278.178039][T50670] hclge_exit+0x28/0xd0 [hclge] [15278.182730][T50670] __se_sys_delete_module.isra.0+0x164/0x230 [15278.188550][T50670] __arm64_sys_delete_module+0x1c/0x30 [15278.193848][T50670] invoke_syscall+0x50/0x11c [15278.198278][T50670] el0_svc_common.constprop.0+0x158/0x164 [15278.203837][T50670] do_el0_svc+0x34/0xcc [15278.207834][T50670] el0_svc+0x20/0x30 For details, see the following figure. rmmod hclge disable VFs ---------------------------------------------------- hclge_exit() sriov_numvfs_store() ... device_lock() pci_disable_sriov() hns3_pci_sriov_configure() pci_disable_sriov() sriov_disable() sriov_disable() if !num_VFs : if !num_VFs : return; return; sriov_del_vfs() sriov_del_vfs() ... ... klist_put() klist_put() ... ... num_VFs = 0; num_VFs = 0; device_unlock(); In this patch, when driver is removing, we get the device_lock() to protect num_VFs, just like sriov_numvfs_store().
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/590a4b2d4e0b73586e88bce9b8135b593355ec09 URL:https://git.kernel.org/stable/c/590a4b2d4e0b73586e88bce9b8135b593355ec09 MISC:https://git.kernel.org/stable/c/719edd9f3372ce7fb3b157647c6658672946874b URL:https://git.kernel.org/stable/c/719edd9f3372ce7fb3b157647c6658672946874b MISC:https://git.kernel.org/stable/c/76b155e14d9b182ce83d32ada2d0d7219ea8c8dd URL:https://git.kernel.org/stable/c/76b155e14d9b182ce83d32ada2d0d7219ea8c8dd MISC:https://git.kernel.org/stable/c/7ae4e56de7dbd0999578246a536cf52a63f4056d URL:https://git.kernel.org/stable/c/7ae4e56de7dbd0999578246a536cf52a63f4056d MISC:https://git.kernel.org/stable/c/a0df055775f30850c0da8f7dab40d67c0fd63908 URL:https://git.kernel.org/stable/c/a0df055775f30850c0da8f7dab40d67c0fd63908 MISC:https://git.kernel.org/stable/c/b5c94e4d947d15d521e935ff10c5a22a7883dea5 URL:https://git.kernel.org/stable/c/b5c94e4d947d15d521e935ff10c5a22a7883dea5 MISC:https://git.kernel.org/stable/c/df3dff8ab6d79edc942464999d06fbaedf8cdd18 URL:https://git.kernel.org/stable/c/df3dff8ab6d79edc942464999d06fbaedf8cdd18 MISC:https://git.kernel.org/stable/c/e36482b222e00cc7aeeea772fc0cf2943590bc4d URL:https://git.kernel.org/stable/c/e36482b222e00cc7aeeea772fc0cf2943590bc4d
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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