netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path

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commit 0d459e2ffb upstream.

The commit mutex should not be released during the critical section
between nft_gc_seq_begin() and nft_gc_seq_end(), otherwise, async GC
worker could collect expired objects and get the released commit lock
within the same GC sequence.

nf_tables_module_autoload() temporarily releases the mutex to load
module dependencies, then it goes back to replay the transaction again.
Move it at the end of the abort phase after nft_gc_seq_end() is called.

Cc: stable@vger.kernel.org
Fixes: 720344340f ("netfilter: nf_tables: GC transaction race with abort path")
Reported-by: Kuan-Ting Chen <hexrabbit@devco.re>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Pablo Neira Ayuso 2024-04-08 23:19:29 +02:00 • committed by Greg Kroah-Hartman

parent 37fc2cde9d

commit eb769ff4e2

1 changed files with 8 additions and 5 deletions

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net/netfilter/nf_tables_api.c

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