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authorMichael Santos <michael.santos@gmail.com>2010-07-23 11:29:20 -0400
committerBjörn Gustavsson <bjorn@erlang.org>2010-07-26 14:42:31 +0200
commitd61d41e235bc464a15925e6fd1b7e9138477d3b3 (patch)
treec1525cc5a4c0ba1cd52bf281716c710900754b31 /erts
parent227d3f3ff078426ae79b7f2313bc8be915c5e252 (diff)
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inet: fix getservbyname buffer overflow
The byte holding the length of the interface name for the getservbyname/2 function is used in a signed context and can become negative, causing the buffer to be overrun. Make the same change for getservbyport/2. Test case: inet:getservbyname(list_to_atom(lists:flatten(lists:duplicate(128, "x"))), tcp).
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/drivers/common/inet_drv.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 87dc63509d..8e312c0292 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -6847,13 +6847,13 @@ static int inet_ctl(inet_descriptor* desc, int cmd, char* buf, int len,
if (len < 2)
return ctl_error(EINVAL, rbuf, rsize);
- n = buf[0]; buf++; len--;
+ n = get_int8(buf); buf++; len--;
if (n >= len) /* the = sign makes the test inklude next length byte */
return ctl_error(EINVAL, rbuf, rsize);
memcpy(namebuf, buf, n);
namebuf[n] = '\0';
len -= n; buf += n;
- n = buf[0]; buf++; len--;
+ n = get_int8(buf); buf++; len--;
if (n > len)
return ctl_error(EINVAL, rbuf, rsize);
memcpy(protobuf, buf, n);
@@ -6876,7 +6876,7 @@ static int inet_ctl(inet_descriptor* desc, int cmd, char* buf, int len,
port = get_int16(buf);
port = sock_htons(port);
buf += 2;
- n = buf[0]; buf++; len -= 3;
+ n = get_int8(buf); buf++; len -= 3;
if (n > len)
return ctl_error(EINVAL, rbuf, rsize);
memcpy(protobuf, buf, n);