CVE-2021-47182

In the Linux kernel, the following vulnerability has been resolved: scsi:
core: Fix scsi_mode_sense() buffer length handling Several problems exist
with scsi_mode_sense() buffer length handling: 1) The allocation length
field of the MODE SENSE(10) command is 16-bits, occupying bytes 7 and 8 of
the CDB. With this command, access to mode pages larger than 255 bytes is
thus possible. However, the CDB allocation length field is set by assigning
len to byte 8 only, thus truncating buffer length larger than 255. 2) If
scsi_mode_sense() is called with len smaller than 8 with
sdev->use_10_for_ms set, or smaller than 4 otherwise, the buffer length is
increased to 8 and 4 respectively, and the buffer is zero filled with these
increased values, thus corrupting the memory following the buffer. Fix
these 2 problems by using put_unaligned_be16() to set the allocation length
field of MODE SENSE(10) CDB and by returning an error when len is too
small. Furthermore, if len is larger than 255B, always try MODE SENSE(10)
first, even if the device driver did not set sdev->use_10_for_ms. In case
of invalid opcode error for MODE SENSE(10), access to mode pages larger
than 255 bytes are not retried using MODE SENSE(6). To avoid buffer length
overflows for the MODE_SENSE(10) case, check that len is smaller than 65535
bytes. While at it, also fix the folowing: * Use get_unaligned_be16() to
retrieve the mode data length and block descriptor length fields of the
mode sense reply header instead of using an open coded calculation. * Fix
the kdoc dbd argument explanation: the DBD bit stands for Disable Block
Descriptor, which is the opposite of what the dbd argument description was.