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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-07-23 16:49:57 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-23 21:09:57 +0200 |
| commit | 17ad73e941b71f3bec7523ea4e9cbc3752461c2d (patch) | |
| tree | ab46ae77452cfd8c5be79e9601d1d149c8b489e1 /net/ax25 | |
| parent | cxgb4: add missing release on skb in uld_send() (diff) | |
| download | linux-17ad73e941b71f3bec7523ea4e9cbc3752461c2d.tar.xz linux-17ad73e941b71f3bec7523ea4e9cbc3752461c2d.zip | |
AX.25: Prevent integer overflows in connect and sendmsg
We recently added some bounds checking in ax25_connect() and
ax25_sendmsg() and we so we removed the AX25_MAX_DIGIS checks because
they were no longer required.
Unfortunately, I believe they are required to prevent integer overflows
so I have added them back.
Fixes: 8885bb0621f0 ("AX.25: Prevent out-of-bounds read in ax25_sendmsg()")
Fixes: 2f2a7ffad5c6 ("AX.25: Fix out-of-bounds read in ax25_connect()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ax25')
| -rw-r--r-- | net/ax25/af_ax25.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index 0862fe49d434..dec3f35467c9 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1188,6 +1188,7 @@ static int __must_check ax25_connect(struct socket *sock, fsa->fsa_ax25.sax25_ndigis != 0) { /* Valid number of digipeaters ? */ if (fsa->fsa_ax25.sax25_ndigis < 1 || + fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS || addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) { err = -EINVAL; @@ -1509,7 +1510,9 @@ static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; /* Valid number of digipeaters ? */ - if (usax->sax25_ndigis < 1 || addr_len < sizeof(struct sockaddr_ax25) + + if (usax->sax25_ndigis < 1 || + usax->sax25_ndigis > AX25_MAX_DIGIS || + addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * usax->sax25_ndigis) { err = -EINVAL; goto out; |