diff options
| author | Eric Dumazet <[email protected]> | 2017-05-19 14:17:48 -0700 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2017-05-22 11:47:44 -0400 |
| commit | 232cd35d0804cc241eb887bb8d4d9b3b9881c64a (patch) | |
| tree | c4c562db86e7f3c60775748ce696efc2a0b8b54b /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 6d18c732b95c0a9d35e9f978b4438bba15412284 (diff) | |
ipv6: fix out of bound writes in __ip6_append_data()
Andrey Konovalov and [email protected] reported crashes caused by
one skb shared_info being overwritten from __ip6_append_data()
Andrey program lead to following state :
copy -4200 datalen 2000 fraglen 2040
maxfraglen 2040 alloclen 2048 transhdrlen 0 offset 0 fraggap 6200
The skb_copy_and_csum_bits(skb_prev, maxfraglen, data + transhdrlen,
fraggap, 0); is overwriting skb->head and skb_shared_info
Since we apparently detect this rare condition too late, move the
code earlier to even avoid allocating skb and risking crashes.
Once again, many thanks to Andrey and syzkaller team.
Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: Andrey Konovalov <[email protected]>
Tested-by: Andrey Konovalov <[email protected]>
Reported-by: <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions