Jakub Kicinski c47c83f6f2 netlink: make sure we allow at least one dump skb ... commit a215b57239 upstream. Commit under Fixes tightened up the memory accounting for Netlink sockets. Looks like the accounting is too strict for some existing use cases, Marek reported issues with nl80211 / WiFi iw CLI. To reduce number of iterations Netlink dumps try to allocate messages based on the size of the buffer passed to previous recvmsg() calls. If user space uses a larger buffer in recvmsg() than sk_rcvbuf we will allocate an skb we won't be able to queue. Make sure we always allow at least one skb to be queued. Same workaround is already present in netlink_attachskb(). Alternative would be to cap the allocation size to rcvbuf - rmem_alloc but as I said, the workaround is already present in other places. Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/9794af18-4905-46c6-b12c-365ea2f05858@samsung.com Fixes: ae8f160e7e ("netlink: Fix wraparounds of sk->sk_rmem_alloc.") Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Link: https://patch.msgid.link/20250711001121.3649033-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-07-17 18:30:50 +02:00
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af_netlink.c	netlink: make sure we allow at least one dump skb	2025-07-17 18:30:50 +02:00
af_netlink.h	netlink: terminate outstanding dump on socket close	2024-12-14 19:50:34 +01:00
diag.c	netlink: Add __sock_i_ino() for __netlink_diag_dump().	2023-07-23 13:46:56 +02:00
genetlink.c	genetlink: hold RCU in genlmsg_mcast()	2024-11-01 01:52:34 +01:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	netlink: add infrastructure to expose policies to userspace	2020-04-30 17:51:42 -07:00
policy.c	net: genl: fix error path memory leak in policy dumping	2022-08-25 11:40:25 +02:00