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slirp: check sscanf result when emulating ident 

When emulating ident in tcp_emu, if the strchr checks passed but the
sscanf check failed, two uninitialized variables would be copied and
sent in the reply, so move this code inside the if(sscanf()) clause.

Signed-off-by: William Bowling <will@wbowling.info>
Cc: qemu-stable@nongnu.org
Cc: secalert@redhat.com
Message-Id: <1551476756-25749-1-git-send-email-will@wbowling.info>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
William Bowling 2019-03-01 21:45:56 +00:00 committed by Samuel Thibault
parent 6c419a1e06
commit d3222975c7
1 changed files with 5 additions and 5 deletions
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10
slirp/tcp_subr.c
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@ -664,12 +664,12 @@ tcp_emu(struct socket *so, struct mbuf *m)
break; break;
} }
} }
so_rcv->sb_cc = snprintf(so_rcv->sb_data,
so_rcv->sb_datalen,
"%d,%d\r\n", n1, n2);
so_rcv->sb_rptr = so_rcv->sb_data;
so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
} }
so_rcv->sb_cc = snprintf(so_rcv->sb_data,
so_rcv->sb_datalen,
"%d,%d\r\n", n1, n2);
so_rcv->sb_rptr = so_rcv->sb_data;
so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
} }
m_free(m); m_free(m);
return 0; return 0;