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| author |   Jiaming Zhang <r772577952@gmail.com> | 2025-11-12 01:36:52 +0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2025-11-13 17:23:21 -0800 |
| commit | f796a8dec9beafcc0f6f0d3478ed685a15c5e062 (patch) | |
| tree | 5a1fc3ac92daf850b23698da19ed347be27fc1aa /net/unix/sysctl_net_unix.c | |
| parent | MAINTAINERS: Remove eth bridge website (diff) | |
| download | wireguard-linux-f796a8dec9beafcc0f6f0d3478ed685a15c5e062.tar.xz wireguard-linux-f796a8dec9beafcc0f6f0d3478ed685a15c5e062.zip | |
net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()
The ethtool tsconfig Netlink path can trigger a null pointer
dereference. A call chain such as:
tsconfig_prepare_data() ->
dev_get_hwtstamp_phylib() ->
vlan_hwtstamp_get() ->
generic_hwtstamp_get_lower() ->
generic_hwtstamp_ioctl_lower()
results in generic_hwtstamp_ioctl_lower() being called with
kernel_cfg->ifr as NULL.
The generic_hwtstamp_ioctl_lower() function does not expect
a NULL ifr and dereferences it, leading to a system crash.
Fix this by adding a NULL check for kernel_cfg->ifr in
generic_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL.
Fixes: 6e9e2eed4f39 ("net: ethtool: Add support for tsconfig command to get/set hwtstamp config")
Closes: https://lore.kernel.org/cd6a7056-fa6d-43f8-b78a-f5e811247ba8@linux.dev
Signed-off-by: Jiaming Zhang <r772577952@gmail.com>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20251111173652.749159-2-r772577952@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions