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authorJo-Philipp Wich <jow@openwrt.org>2014-08-12 11:14:11 +0000
committerJo-Philipp Wich <jow@openwrt.org>2014-08-12 11:14:11 +0000
commiteb02b887ff2e71b28c47205f2c4070e9139bc2a0 (patch)
treea519ee0446a42522ebbcc913aff13c0038f2de30
parent24696a06ad504807a0e5207c46ca488c5f70e02d (diff)
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package: fix segfault of iwinfo.scanlist("radio0").
This is a bug revealed in r41830. First, the static variable `char nif[IFNAMSIZ]` of nl80211_phy2ifname() would be zeroed out if the argument is "wlan0" or the like. This will happen in the following call stack. nl80211_get_scanlist("radio0", buf, len); nl80211_phy2ifname("radio0") // return static var nif with content "wlan0" nl80211_get_scanlist(nif, buf, len); // tail call nl80211_get_mode(nif); nl80211_phy2ifname(nif); // zero out nif Later we try nl80211_ifadd("") which was supposed to create interface "tmp.", but that won't happen because nl80211_msg() will put an invalid ifidx 0 to the nlmsg. Then iwinfo_ifup() and iwinfo_ifdown() would fail and happily nl80211_get_scanlist() returned 0 and left *len undefined. Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com> SVN-Revision: 42151
-rw-r--r--package/network/utils/iwinfo/src/iwinfo_lua.c2
-rw-r--r--package/network/utils/iwinfo/src/iwinfo_nl80211.c9
2 files changed, 9 insertions, 2 deletions
diff --git a/package/network/utils/iwinfo/src/iwinfo_lua.c b/package/network/utils/iwinfo/src/iwinfo_lua.c
index 9b7d6554db..cdb90d5b47 100644
--- a/package/network/utils/iwinfo/src/iwinfo_lua.c
+++ b/package/network/utils/iwinfo/src/iwinfo_lua.c
@@ -362,7 +362,7 @@ static int iwinfo_L_txpwrlist(lua_State *L, int (*func)(const char *, char *, in
/* Wrapper for scan list */
static int iwinfo_L_scanlist(lua_State *L, int (*func)(const char *, char *, int *))
{
- int i, x, len;
+ int i, x, len = 0;
char rv[IWINFO_BUFSIZE];
char macstr[18];
const char *ifname = luaL_checkstring(L, 1);
diff --git a/package/network/utils/iwinfo/src/iwinfo_nl80211.c b/package/network/utils/iwinfo/src/iwinfo_nl80211.c
index 98200bfef7..33c62387e3 100644
--- a/package/network/utils/iwinfo/src/iwinfo_nl80211.c
+++ b/package/network/utils/iwinfo/src/iwinfo_nl80211.c
@@ -215,6 +215,9 @@ static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
int ifidx = -1, phyidx = -1;
struct nl80211_msg_conveyor *cv;
+ if (ifname == NULL)
+ return NULL;
+
if (nl80211_init() < 0)
return NULL;
@@ -227,7 +230,8 @@ static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
else
ifidx = if_nametoindex(ifname);
- if ((ifidx < 0) && (phyidx < 0))
+ /* Valid ifidx must be greater than 0 */
+ if ((ifidx <= 0) && (phyidx < 0))
return NULL;
cv = nl80211_new(nls->nl80211, cmd, flags);
@@ -500,12 +504,15 @@ static char * nl80211_phy2ifname(const char *ifname)
DIR *d;
struct dirent *e;
+ /* Only accept phy name of the form phy%d or radio%d */
if (!ifname)
return NULL;
else if (!strncmp(ifname, "phy", 3))
phyidx = atoi(&ifname[3]);
else if (!strncmp(ifname, "radio", 5))
phyidx = atoi(&ifname[5]);
+ else
+ return NULL;
memset(nif, 0, sizeof(nif));