ipv6: add NULL checks for idev in SRv6 paths

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[ Upstream commit 0641379352 ]

__in6_dev_get() can return NULL when the device has no IPv6 configuration
(e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER).

Add NULL checks for idev returned by __in6_dev_get() in both
seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL
pointer dereferences.

Fixes: 1ababeba4a ("ipv6: implement dataplane support for rthdr type 4 (Segment Routing Header)")
Fixes: bf355b8d2c ("ipv6: sr: add core files for SR HMAC support")
Signed-off-by: Minhong He <heminhong@kylinos.cn>
Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Link: https://patch.msgid.link/20260316073301.106643-1-heminhong@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Li hongliang <1468888505@139.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Minhong He 2026-04-20 13:43:21 +08:00 • committed by Greg Kroah-Hartman

parent 031207f89c

commit 83d705d35e

2 changed files with 6 additions and 0 deletions

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4

net/ipv6/exthdrs.c

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2

net/ipv6/seg6_hmac.c

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