https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213481
Bug ID: 213481
Summary: SMbus ioctls don't transfer the struct smbcmd's rdata
back to userland
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Commands that return data in rdata don't work as documented.
As an example, SMB_READW is documented as returning the word read from the
device in rdata.word. However, this doesn’t happen, because the ioctl request
value is defined using _IOW(), so the kernel doesn’t copy the data it read back
out.
In prior versions, the structure had only a pointer to the data, and the smb.c
code used copyout() to transfer the data back to userland.
A temporary work-around is to set rbuf to point to rdata.word and rcount to
two.
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