Re: [PATCH v2 net] igmp: convert struct ip_sf_list to RCU

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Thu, 27 Aug 2026 16:06:56 +0000 you wrote:

Commit 23d2b94043ca ("igmp: Add ip_mc_list lock in ip_check_mc_rcu")
added spin_lock_bh(&im->lock) to ip_check_mc_rcu() to prevent a
use-after-free while iterating im->sources during concurrent deletions.

However, ip_check_mc_rcu() is called from RCU read-side critical
sections in packet receive and route lookup fast paths (e.g.
__mkroute_output(), ip_route_input_rcu(), and __udp4_lib_rcv()).

[...]

Here is the summary with links:
  - [v2,net] igmp: convert struct ip_sf_list to RCU
    https://git.kernel.org/netdev/net/c/2987ee196c88

You are awesome, thank you!
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