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author | Mateusz Jurczyk <mjurczyk@google.com> | 2017-06-07 15:14:29 +0200 |
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committer | David S. Miller <davem@davemloft.net> | 2017-06-08 10:38:54 -0400 |
commit | 85eac2ba35a2dbfbdd5767c7447a4af07444a5b4 (patch) | |
tree | be809e06a3e4330b99b82ed588b359f8e013cf87 /crypto/842.c | |
parent | ed66e50d9587fc0bb032e276a2563c0068a5b63a (diff) |
decnet: dn_rtmsg: Improve input length sanitization in dnrmg_receive_user_skb
Verify that the length of the socket buffer is sufficient to cover the
entire nlh->nlmsg_len field before accessing that field for further
input sanitization. If the client only supplies 1-3 bytes of data in
sk_buff, then nlh->nlmsg_len remains partially uninitialized and
contains leftover memory from the corresponding kernel allocation.
Operating on such data may result in indeterminate evaluation of the
nlmsg_len < sizeof(*nlh) expression.
The bug was discovered by a runtime instrumentation designed to detect
use of uninitialized memory in the kernel. The patch prevents this and
other similar tools (e.g. KMSAN) from flagging this behavior in the future.
Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto/842.c')
0 files changed, 0 insertions, 0 deletions