diff options
| author | Florent Revest <[email protected]> | 2023-07-03 16:52:16 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <[email protected]> | 2023-07-05 14:42:15 +0200 |
| commit | 6eef7a2b933885a17679eb8ed0796ddf0ee5309b (patch) | |
| tree | 61f894d8e56fec0a17341c8605cc36041a884757 /drivers/usb/cdns3/cdns3-imx.c | |
| parent | 8a9dc07ba92497a81f1ff65d25c2ba7b6f9a8bdc (diff) | |
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
If nf_conntrack_init_start() fails (for example due to a
register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini()
clean-up path frees the nf_ct_helper_hash map.
When built with NF_CONNTRACK=y, further netfilter modules (e.g:
netfilter_conntrack_ftp) can still be loaded and call
nf_conntrack_helpers_register(), independently of whether nf_conntrack
initialized correctly. This accesses the nf_ct_helper_hash dangling
pointer and causes a uaf, possibly leading to random memory corruption.
This patch guards nf_conntrack_helper_register() from accessing a freed
or uninitialized nf_ct_helper_hash pointer and fixes possible
uses-after-free when loading a conntrack module.
Cc: [email protected]
Fixes: 12f7a505331e ("netfilter: add user-space connection tracking helper infrastructure")
Signed-off-by: Florent Revest <[email protected]>
Reviewed-by: Florian Westphal <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
Diffstat (limited to 'drivers/usb/cdns3/cdns3-imx.c')
0 files changed, 0 insertions, 0 deletions