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| author | Michal Kubecek <[email protected]> | 2020-12-08 22:13:51 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2020-12-09 23:50:38 +0000 |
| commit | a770bf515613c6e12ae904c3593e26016de99448 (patch) | |
| tree | 070e9e0651e009cf87054dbdad0e7796b35fbb7c /net/ipv6/tcp_ipv6.c | |
| parent | e1000e: fix S0ix flow to allow S0i3.2 subset entry (diff) | |
| download | kernel-a770bf515613c6e12ae904c3593e26016de99448.tar.gz kernel-a770bf515613c6e12ae904c3593e26016de99448.zip | |
ethtool: fix stack overflow in ethnl_parse_bitset()
Syzbot reported a stack overflow in bitmap_from_arr32() called from
ethnl_parse_bitset() when bitset from netlink message is longer than
target bitmap length. While ethnl_compact_sanity_checks() makes sure that
trailing part is all zeros (i.e. the request does not try to touch bits
kernel does not recognize), we also need to cap change_bits to nbits so
that we don't try to write past the prepared bitmaps.
Fixes: 88db6d1e4f62 ("ethtool: add ethnl_parse_bitset() helper")
Reported-by: [email protected]
Signed-off-by: Michal Kubecek <[email protected]>
Link: https://lore.kernel.org/r/3487ee3a98e14cd526f55b6caaa959d2dcbcad9f.1607465316.git.mkubecek@suse.cz
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
0 files changed, 0 insertions, 0 deletions