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msm: ipa: Protect ipa default routing table 

Protect ipa default routing table from
addition, deletion and modification once after
default rule added by ipa-driver.

Change-Id: I045d9c29fed23edf796d826e440b81124e1f666a
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>
[haggertk: Backport to 3.4/msm8974]
CVE-2018-13900
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Mohammed Javid 2018-09-21 11:42:40 +05:30 committed by Francescodario Cuzzocrea
parent 756a103648
commit 5255a9bc4e
1 changed files with 4 additions and 5 deletions
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9
drivers/platform/msm/ipa/ipa_rt.c
View File

@ -611,13 +611,12 @@ static int __ipa_add_rt_rule(enum ipa_ip_type ip, const char *name,
goto fail_rt_tbl_sanity;
}
/*
* do not allow any rules to be added at end of the "default" routing
* tables
* do not allow any rule to be added at "default" routing
* table
*/
if (!strncmp(tbl->name, IPA_DFLT_RT_TBL_NAME, IPA_RESOURCE_NAME_MAX) &&
(tbl->rule_cnt > 0) && (at_rear != 0)) {
IPAERR("cannot add rule at end of tbl rule_cnt=%d at_rear=%d\n",
tbl->rule_cnt, at_rear);
(tbl->rule_cnt > 0)) {
IPAERR_RL("cannot add rules to default rt table\n");
goto fail_rt_tbl_sanity;
}