CVE-2023-53376

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

scsi: mpi3mr: Use number of bits to manage bitmap sizes

To allocate bitmaps, the mpi3mr driver calculates sizes of bitmaps using

byte as unit. However, bitmap helper functions assume that bitmaps are

allocated using unsigned long as unit. This gap causes memory access beyond

the bitmap sizes and results in "BUG: KASAN: slab-out-of-bounds". The BUG

was observed at firmware download to eHBA-9600. Call trace indicated that

the out-of-bounds access happened in find_first_zero_bit() called from

mpi3mr_send_event_ack() for miroc->evtack_cmds_bitmap.

To fix the BUG, do not use bytes to manage bitmap sizes. Instead, use

number of bits, and call bitmap helper functions which take number of bits

as arguments. For memory allocation, call bitmap_zalloc() instead of

kzalloc() and krealloc(). For memory free, call bitmap_free() instead of

kfree(). For zero clear, call bitmap_clear() instead of memset().

Remove three fields for bitmap byte sizes in struct scmd_priv which are no

longer required. Replace the field dev_handle_bitmap_sz with

dev_handle_bitmap_bits to keep number of bits of removepend_bitmap across

resize.