From: Jakub Kicinski kuba@kernel.org
stable inclusion from stable-v5.10.221 commit f4aa8268d774210e6bbbeb5e9b1570b2d2962d77 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGENG CVE: CVE-2024-42082
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit a78cae2476812cecaa4a33d0086bbb53986906bc ]
xdp_rxq_info_unreg() implicitly calls xdp_rxq_info_unreg_mem_model(). This may well be confusing to the driver authors, and lead to double free if they call xdp_rxq_info_unreg_mem_model() before xdp_rxq_info_unreg() (when mem model type == MEM_TYPE_PAGE_POOL).
In fact error path of mvpp2_rxq_init() seems to currently do exactly that.
The double free will result in refcount underflow in page_pool_destroy(). Make the interface a little more programmer friendly by clearing type and id so that xdp_rxq_info_unreg_mem_model() can be called multiple times.
Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Daniel Borkmann daniel@iogearbox.net Link: https://lore.kernel.org/bpf/20210625221612.2637086-1-kuba@kernel.org Stable-dep-of: 7e9f79428372 ("xdp: Remove WARN() from __xdp_reg_mem_model()") Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Liu Jian liujian56@huawei.com --- net/core/xdp.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/net/core/xdp.c b/net/core/xdp.c index b8d7fa47d293..0f0b65981614 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -113,8 +113,13 @@ static void mem_allocator_disconnect(void *allocator) void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq) { struct xdp_mem_allocator *xa; + int type = xdp_rxq->mem.type; int id = xdp_rxq->mem.id;
+ /* Reset mem info to defaults */ + xdp_rxq->mem.id = 0; + xdp_rxq->mem.type = 0; + if (xdp_rxq->reg_state != REG_STATE_REGISTERED) { WARN(1, "Missing register, driver bug"); return; @@ -123,7 +128,7 @@ void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq) if (id == 0) return;
- if (xdp_rxq->mem.type == MEM_TYPE_PAGE_POOL) { + if (type == MEM_TYPE_PAGE_POOL) { rcu_read_lock(); xa = rhashtable_lookup(mem_id_ht, &id, mem_id_rht_params); page_pool_destroy(xa->page_pool); @@ -144,10 +149,6 @@ void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq)
xdp_rxq->reg_state = REG_STATE_UNREGISTERED; xdp_rxq->dev = NULL; - - /* Reset mem info to defaults */ - xdp_rxq->mem.id = 0; - xdp_rxq->mem.type = 0; } EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg);