diff options
| author | Michael Santos <[email protected]> | 2010-07-23 11:28:46 -0400 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2010-07-26 14:42:31 +0200 |
| commit | 227d3f3ff078426ae79b7f2313bc8be915c5e252 (patch) | |
| tree | 2f478ab832a5267a18137e454d638f20641de922 /erts | |
| parent | cfcb9626d95640e42972c2284c08b61240f11d0c (diff) | |
| download | otp-227d3f3ff078426ae79b7f2313bc8be915c5e252.tar.gz otp-227d3f3ff078426ae79b7f2313bc8be915c5e252.tar.bz2 otp-227d3f3ff078426ae79b7f2313bc8be915c5e252.zip | |
inet: fix ifr_name buffer overflow
The byte holding the length of the interface name for the ifget/2
functions is used in a signed context and can become negative,
causing the ifreq.ifr_name buffer to be overrun.
Test case:
inet:ifget(lists:duplicate(128, "x"), [addr]).
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/drivers/common/inet_drv.c | 6 |
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 9ad6e4a845..87dc63509d 100644 --- a/erts/emulator/drivers/common/inet_drv.c +++ b/erts/emulator/drivers/common/inet_drv.c @@ -3905,7 +3905,7 @@ static int inet_ctl_ifget(inet_descriptor* desc, char* buf, int len, INTERFACE_INFO* ifp; long namaddr; - if ((len == 0) || ((namlen = buf[0]) > len)) + if ((len == 0) || ((namlen = get_int8(buf)) > len)) goto error; if (parse_addr(buf+1, namlen, &namaddr) < 0) goto error; @@ -4099,7 +4099,7 @@ static int inet_ctl_ifget(inet_descriptor* desc, char* buf, int len, struct ifreq ifreq; int namlen; - if ((len == 0) || ((namlen = buf[0]) > len)) + if ((len == 0) || ((namlen = get_int8(buf)) > len)) goto error; sys_memset(ifreq.ifr_name, '\0', IFNAMSIZ); sys_memcpy(ifreq.ifr_name, buf+1, @@ -4252,7 +4252,7 @@ static int inet_ctl_ifset(inet_descriptor* desc, char* buf, int len, int namlen; char* b_end = buf + len; - if ((len == 0) || ((namlen = buf[0]) > len)) + if ((len == 0) || ((namlen = get_int8(buf)) > len)) goto error; sys_memset(ifreq.ifr_name, '\0', IFNAMSIZ); sys_memcpy(ifreq.ifr_name, buf+1, |