[Qemu-devel] [PATCH 0/2] slirp: handle errors in sosendoob()

[Peter Maydell <peter.maydell@linaro.org>]

At the moment the slirp sosendoob() function doesn't properly
handle errors from slirp_send(), and its callers don't do
anything with its return value either. (Coverity spots the
latter as CID 1005633.)

This patchset attempts to fix that. In the first patch we
fix sosendoob() itself so that we return errors to the caller
and treat short writes as reducing the amount of urgent data
to be sent. In the second patch we make the call in sowrite()
treat any return form sosendoob() which didn't transfer all
the urgent data as a "disconnect the socket" error in the
same way that it already handles errors for writes of
non-urgent data. The call to sosendoob() in sbappend() can
safely ignore any failures as in this case sowrite() will be
called shortly and will deal with them.

Coding style: I've opted to stick with the tab-indent
that the slirp code uses rather than reindent to QEMU standard.
Happy to go the other way if the maintainer prefers.

Disclaimer: I have not tested these patches very hard and
in particular they deal with error paths and with urgent
data, neither of which I have any test case for...

thanks
-- PMM

Peter Maydell (2):
  slirp: Handle error returns from slirp_send() in sosendoob()
  slirp: Handle error returns from sosendoob()

 slirp/sbuf.c   |  2 +-
 slirp/socket.c | 51 ++++++++++++++++++++++++++++++++++-----------------
 2 files changed, 35 insertions(+), 18 deletions(-)

-- 
2.7.4