diff options
| author | Daniel Willmann <dwillmann@sysmocom.de> | 2014-01-17 15:17:36 +0100 |
|---|---|---|
| committer | Daniel Willmann <daniel@totalueberwachung.de> | 2014-01-28 18:15:15 +0100 |
| commit | 3386e4447df52c62fa08374a2e795f00f08b3a1b (patch) | |
| tree | e2d12dfef0acda0f8a9dba66073416a87bbf7863 | |
| parent | bd892d26dc1862b86caba0e84993cfc47c421ac0 (diff) | |
smpp_smsc: Fix integer overflow in read return value and msgb_alloc()daniel/smpp-fixes
The size parameter of msgb_alloc is uint16_t so any length value above
65535 will allocate a msgb with incorrect size.
This patch changes the type of rdlen and rc to ssize_t (the return value
of read) and guards against the read length being larger than
UINT16_MAX.
To reproduce the issue run:
echo -en "\x00\x01\x00\x01\x01" |socat stdin tcp:localhost:2775
| -rw-r--r-- | openbsc/src/libmsc/smpp_smsc.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/openbsc/src/libmsc/smpp_smsc.c b/openbsc/src/libmsc/smpp_smsc.c index 605bdd5fa..048c1b802 100644 --- a/openbsc/src/libmsc/smpp_smsc.c +++ b/openbsc/src/libmsc/smpp_smsc.c @@ -23,6 +23,7 @@ #include <string.h> #include <stdint.h> #include <errno.h> +#include <limits.h> #include <sys/socket.h> #include <netinet/in.h> @@ -787,15 +788,14 @@ static int esme_link_read_cb(struct osmo_fd *ofd) uint8_t *lenptr = (uint8_t *) &len; uint8_t *cur; struct msgb *msg; - int rdlen; - int rc; + ssize_t rdlen, rc; switch (esme->read_state) { case READ_ST_IN_LEN: rdlen = sizeof(uint32_t) - esme->read_idx; rc = read(ofd->fd, lenptr + esme->read_idx, rdlen); if (rc < 0) - LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %d (%s)\n", + LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %zd (%s)\n", esme->system_id, rc, strerror(errno)); OSMO_FD_CHECK_READ(rc, dead_socket); @@ -803,8 +803,8 @@ static int esme_link_read_cb(struct osmo_fd *ofd) if (esme->read_idx >= sizeof(uint32_t)) { esme->read_len = ntohl(len); - if (esme->read_len < 8) { - LOGP(DSMPP, LOGL_ERROR, "[%s] read length too small %u\n", + if (esme->read_len < 8 || esme->read_len > UINT16_MAX) { + LOGP(DSMPP, LOGL_ERROR, "[%s] length invalid %u\n", esme->system_id, esme->read_len); goto dead_socket; } @@ -824,7 +824,7 @@ static int esme_link_read_cb(struct osmo_fd *ofd) rdlen = esme->read_len - esme->read_idx; rc = read(ofd->fd, msg->tail, OSMO_MIN(rdlen, msgb_tailroom(msg))); if (rc < 0) - LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %d (%s)\n", + LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %zd (%s)\n", esme->system_id, rc, strerror(errno)); OSMO_FD_CHECK_READ(rc, dead_socket); |