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| author | Eric Dumazet <edumazet@google.com> | 2017-02-04 23:18:55 -0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-16 15:03:44 +0200 |
| commit | d30927e95ba09729cbc18ec08f85711a2bf0c7dd (patch) | |
| tree | e62d5928e35f15dd8f1aa0dea4eef4b857afcfed /include/linux/fs.h | |
| parent | dc9e83cd8b989e546734402ac7dbcfa09edf54b2 (diff) | |
ip6_gre: fix ip6gre_err() invalid reads
Andrey Konovalov reported out of bound accesses in ip6gre_err()
If GRE flags contains GRE_KEY, the following expression
*(((__be32 *)p) + (grehlen / 4) - 1)
accesses data ~40 bytes after the expected point, since
grehlen includes the size of IPv6 headers.
Let's use a "struct gre_base_hdr *greh" pointer to make this
code more readable.
p[1] becomes greh->protocol.
grhlen is the GRE header length.
Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Change-Id: I53521c4c78af847e1ba5381199213fa0c5a01e5c
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/fs.h')
0 files changed, 0 insertions, 0 deletions