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apparmor: add missing id bounds check on dfa verification

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Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen
2016-06-02 02:37:02 -07:00
parent ff118479a7
commit 15756178c6
2 changed files with 3 additions and 0 deletions
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2
security/apparmor/match.c
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@@ -47,6 +47,8 @@ static struct table_header *unpack_table(char *blob, size_t bsize)
* it every time we use td_id as an index
*/
th.td_id = be16_to_cpu(*(u16 *) (blob)) - 1;
if (th.td_id > YYTD_ID_MAX)
goto out;
th.td_flags = be16_to_cpu(*(u16 *) (blob + 2));
th.td_lolen = be32_to_cpu(*(u32 *) (blob + 8));
blob += sizeof(struct table_header);