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[2001:8b0:1d0::2]) by mx.google.com with ESMTPS id 42si4424016lja.220.2017.07.14.04.12.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Jul 2017 04:12:29 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 2001:8b0:1d0::2 as permitted sender) client-ip=2001:8b0:1d0::2; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 2001:8b0:1d0::2 as permitted sender) smtp.mailfrom=pm215@archaic.org.uk; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from pm215 by orth.archaic.org.uk with local (Exim 4.84_2) (envelope-from ) id 1dVyWJ-0007qA-Gs; Fri, 14 Jul 2017 12:12:27 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Cc: patches@linaro.org, Samuel Thibault , Jan Kiszka , "Dr . David Alan Gilbert" Subject: [PATCH v2 1/2] slirp: Handle error returns from slirp_send() in sosendoob() Date: Fri, 14 Jul 2017 12:12:24 +0100 Message-Id: <1500030745-10619-2-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1500030745-10619-1-git-send-email-peter.maydell@linaro.org> References: <1500030745-10619-1-git-send-email-peter.maydell@linaro.org> The code in sosendoob() assumes that slirp_send() always succeeds, but it might return an OS error code (for instance if the other end has disconnected). Catch these and return the caller either -1 on error or the number of urgent bytes actually written. (None of the callers check this return value currently, though.) Signed-off-by: Peter Maydell Reviewed-by: Dr. David Alan Gilbert Message-id: 1496679576-14336-2-git-send-email-peter.maydell@linaro.org --- slirp/socket.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) -- 2.7.4 diff --git a/slirp/socket.c b/slirp/socket.c index 3b49a69..a17caa9 100644 --- a/slirp/socket.c +++ b/slirp/socket.c @@ -345,33 +345,40 @@ sosendoob(struct socket *so) if (sb->sb_rptr < sb->sb_wptr) { /* We can send it directly */ n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */ - so->so_urgc -= n; - - DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); } else { /* * Since there's no sendv or sendtov like writev, * we must copy all data to a linear buffer then * send it all */ + uint32_t urgc = so->so_urgc; len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr; - if (len > so->so_urgc) len = so->so_urgc; + if (len > urgc) { + len = urgc; + } memcpy(buff, sb->sb_rptr, len); - so->so_urgc -= len; - if (so->so_urgc) { + urgc -= len; + if (urgc) { n = sb->sb_wptr - sb->sb_data; - if (n > so->so_urgc) n = so->so_urgc; + if (n > urgc) { + n = urgc; + } memcpy((buff + len), sb->sb_data, n); - so->so_urgc -= n; len += n; } n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */ + } + #ifdef DEBUG - if (n != len) - DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n")); + if (n != len) { + DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n")); + } #endif - DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); + if (n < 0) { + return n; } + so->so_urgc -= n; + DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); sb->sb_cc -= n; sb->sb_rptr += n;