CVE-2024-50153

In the Linux kernel, the following vulnerability has been resolved:

scsi: target: core: Fix null-ptr-deref in target_alloc_device()

There is a null-ptr-deref issue reported by KASAN:

BUG: KASAN: null-ptr-deref in target_alloc_device+0xbc4/0xbe0 [target_core_mod] … kasan_report+0xb9/0xf0 target_alloc_device+0xbc4/0xbe0 [target_core_mod] core_dev_setup_virtual_lun0+0xef/0x1f0 [target_core_mod] target_core_init_configfs+0x205/0x420 [target_core_mod] do_one_initcall+0xdd/0x4e0 … entry_SYSCALL_64_after_hwframe+0x76/0x7e

In target_alloc_device(), if allocing memory for dev queues fails, then dev will be freed by dev->transport->free_device(), but dev->transport is not initialized at that time, which will lead to a null pointer reference problem.

Fixing this bug by freeing dev with hba->backend->ops->free_device().

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/14a6a2adb440e4ae97bee73b2360946bd033dadd
• https://git.kernel.org/stable/c/39e02fa90323243187c91bb3e8f2f5f6a9aacfc7
• https://git.kernel.org/stable/c/895ab729425ef9bf3b6d2f8d0853abe64896f314
• https://git.kernel.org/stable/c/8c1e6717f60d31f8af3937c23c4f1498529584e1
• https://git.kernel.org/stable/c/b80e9bc85bd9af378e7eac83e15dd129557bbdb6
• https://git.kernel.org/stable/c/fca6caeb4a61d240f031914413fcc69534f6dc03