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geom: Report copyout() errors in g_ctl_ioctl_ctl()

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Despite the name, req->serror is used in some cases to copy non-error
messages to userspace.  So, report errors when copying out so long as
they don't clobber an earlier error.

Reviewed by:	mav, imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D43146
This commit is contained in:
Mark Johnston 2023-12-25 20:43:06 -05:00
parent 6cdff09c0d
commit bbf221e3e8
1 changed files with 3 additions and 1 deletions
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4
sys/geom/geom_ctl.c
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@ -616,8 +616,10 @@ g_ctl_ioctl_ctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct th
}
}
if (sbuf_done(req->serror)) {
copyout(sbuf_data(req->serror), req->error,
nerror = copyout(sbuf_data(req->serror), req->error,
imin(req->lerror, sbuf_len(req->serror) + 1));
if (nerror != 0 && req->nerror == 0)
req->nerror = nerror;
}
nerror = req->nerror;