CVE-2024-26692

In the Linux kernel, the following vulnerability has been resolved: smb:
Fix regression in writes when non-standard maximum write size negotiated
The conversion to netfs in the 6.3 kernel caused a regression when maximum
write size is set by the server to an unexpected value which is not a
multiple of 4096 (similarly if the user overrides the maximum write size by
setting mount parm “wsize”, but sets it to a value that is not a multiple
of 4096). When negotiated write size is not a multiple of 4096 the netfs
code can skip the end of the final page when doing large sequential writes,
causing data corruption. This section of code is being rewritten/removed
due to a large netfs change, but until that point (ie for the 6.3 kernel
until now) we can not support non-standard maximum write sizes. Add a
warning if a user specifies a wsize on mount that is not a multiple of 4096
(and round down), also add a change where we round down the maximum write
size if the server negotiates a value that is not a multiple of 4096 (we
also have to check to make sure that we do not round it down to zero).