6.12-stable review patch. If anyone has any objections, please let me know.
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From: Zhen Ni zhen.ni@easystack.cn
commit 9158c6bb245113d4966df9b2ba602197a379412e upstream.
afs_put_server() accessed server->debug_id before the NULL check, which could lead to a null pointer dereference. Move the debug_id assignment, ensuring we never dereference a NULL server pointer.
Fixes: 2757a4dc1849 ("afs: Fix access after dec in put functions") Cc: stable@vger.kernel.org Signed-off-by: Zhen Ni zhen.ni@easystack.cn Acked-by: David Howells dhowells@redhat.com Reviewed-by: Jeffrey Altman jaltman@auristor.com Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/afs/server.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/afs/server.c +++ b/fs/afs/server.c @@ -394,13 +394,14 @@ struct afs_server *afs_use_server(struct void afs_put_server(struct afs_net *net, struct afs_server *server, enum afs_server_trace reason) { - unsigned int a, debug_id = server->debug_id; + unsigned int a, debug_id; bool zero; int r;
if (!server) return;
+ debug_id = server->debug_id; a = atomic_read(&server->active); zero = __refcount_dec_and_test(&server->ref, &r); trace_afs_server(debug_id, r - 1, a, reason);