On Tue, Oct 24, 2017 at 01:26:49PM -0400, Weston Andros Adamson wrote:
> Is there a reason to BUG() in these places? Couldn't we WARN_ON_ONCE and return an error?
I think the BUG() will just kill an nfsd thread that isn't holding any
interesting locks.
The failures look unlikely. (Except for that read_u32... return, I
wonder if we're missing a check there.)
--b.
>
> -dros
>
> > On Oct 23, 2017, at 4:31 PM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> >
> > In the past we've avoided BUG_ON(X) where X might have side effects, on
> > the theory that it should actually be OK just to compile out BUG_ON()s.
> > Has that changed?
> >
> > In any case, I don't find that this improves readability; dropping.
> >
> > --b.
> >
> > On Mon, Oct 23, 2017 at 01:16:35PM -0500, Gustavo A. R. Silva wrote:
> >> Use BUG_ON instead of if condition followed by BUG.
> >>
> >> This issue was detected with the help of Coccinelle.
> >>
> >> Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
> >> ---
> >> net/sunrpc/auth_gss/svcauth_gss.c | 9 +++------
> >> 1 file changed, 3 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
> >> index 7b1ee5a..a10ce43 100644
> >> --- a/net/sunrpc/auth_gss/svcauth_gss.c
> >> +++ b/net/sunrpc/auth_gss/svcauth_gss.c
> >> @@ -855,11 +855,9 @@ unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct g
> >> return stat;
> >> if (integ_len > buf->len)
> >> return stat;
> >> - if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
> >> - BUG();
> >> + BUG_ON(xdr_buf_subsegment(buf, &integ_buf, 0, integ_len));
> >> /* copy out mic... */
> >> - if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
> >> - BUG();
> >> + BUG_ON(read_u32_from_xdr_buf(buf, integ_len, &mic.len));
> >> if (mic.len > RPC_MAX_AUTH_SIZE)
> >> return stat;
> >> mic.data = kmalloc(mic.len, GFP_KERNEL);
> >> @@ -1611,8 +1609,7 @@ svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
> >> BUG_ON(integ_len % 4);
> >> *p++ = htonl(integ_len);
> >> *p++ = htonl(gc->gc_seq);
> >> - if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
> >> - BUG();
> >> + BUG_ON(xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len));
> >> if (resbuf->tail[0].iov_base == NULL) {
> >> if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
> >> goto out_err;
> >> --
> >> 2.7.4
> > --
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