CVE-2024-40901

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: mpt3sas: Avoid test/set_bit() operating in non-allocated memory<br /> <br /> There is a potential out-of-bounds access when using test_bit() on a single<br /> word. The test_bit() and set_bit() functions operate on long values, and<br /> when testing or setting a single word, they can exceed the word<br /> boundary. KASAN detects this issue and produces a dump:<br /> <br /> BUG: KASAN: slab-out-of-bounds in _scsih_add_device.constprop.0 (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 drivers/scsi/mpt3sas/mpt3sas_scsih.c:7331) mpt3sas<br /> <br /> Write of size 8 at addr ffff8881d26e3c60 by task kworker/u1536:2/2965<br /> <br /> For full log, please look at [1].<br /> <br /> Make the allocation at least the size of sizeof(unsigned long) so that<br /> set_bit() and test_bit() have sufficient room for read/write operations<br /> without overwriting unallocated memory.<br /> <br /> [1] Link: https://lore.kernel.org/all/ZkNcALr3W3KGYYJG@gmail.com/