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| author |   Peilin Ye <yepeilin.cs@gmail.com> | 2020-07-22 11:19:01 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-07-22 17:56:40 -0700 |
| commit | 2f2a7ffad5c6cbf3d438e813cfdc88230e185ba6 (patch) | |
| tree | db2289e67686fae52fea86f60b8d80e0dcdb3f36 /net/sctp | |
| parent | enetc: Remove the mdio bus on PF probe bailout (diff) | |
| download | linux-dev-2f2a7ffad5c6cbf3d438e813cfdc88230e185ba6.tar.xz linux-dev-2f2a7ffad5c6cbf3d438e813cfdc88230e185ba6.zip | |
AX.25: Fix out-of-bounds read in ax25_connect()
Checks on `addr_len` and `fsa->fsa_ax25.sax25_ndigis` are insufficient.
ax25_connect() can go out of bounds when `fsa->fsa_ax25.sax25_ndigis`
equals to 7 or 8. Fix it.
This issue has been reported as a KMSAN uninit-value bug, because in such
a case, ax25_connect() reaches into the uninitialized portion of the
`struct sockaddr_storage` statically allocated in __sys_connect().
It is safe to remove `fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS` because
`addr_len` is guaranteed to be less than or equal to
`sizeof(struct full_sockaddr_ax25)`.
Reported-by: syzbot+c82752228ed975b0a623@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=55ef9d629f3b3d7d70b69558015b63b48d01af66
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
0 files changed, 0 insertions, 0 deletions