From 7f229a7c84adce1a06d4b022a2ade639729d59dc Mon Sep 17 00:00:00 2001 From: KhaiWenTan Date: Fri, 29 Nov 2024 11:17:57 +0800 Subject: [PATCH] net: stmmac: Fix zero-division error when disabling tc cbs stable inclusion from stable-v5.10.227 commit e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYR8Y CVE: CVE-2024-49977 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e33fe25b1efe4f2e6a5858786dbc82ae4c44ed4c -------------------------------- commit 675faf5a14c14a2be0b870db30a70764df81e2df upstream. The commit b8c43360f6e4 ("net: stmmac: No need to calculate speed divider when offload is disabled") allows the "port_transmit_rate_kbps" to be set to a value of 0, which is then passed to the "div_s64" function when tc-cbs is disabled. This leads to a zero-division error. When tc-cbs is disabled, the idleslope, sendslope, and credit values the credit values are not required to be configured. Therefore, adding a return statement after setting the txQ mode to DCB when tc-cbs is disabled would prevent a zero-division error. Fixes: b8c43360f6e4 ("net: stmmac: No need to calculate speed divider when offload is disabled") Cc: Co-developed-by: Choong Yong Liang Signed-off-by: Choong Yong Liang Signed-off-by: KhaiWenTan Reviewed-by: Simon Horman Link: https://patch.msgid.link/20240918061422.1589662-1-khai.wen.tan@linux.intel.com Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman Signed-off-by: Wang Liang --- drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c index 2429c57fa452..5afa592a8cdf 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c @@ -362,6 +362,7 @@ static int tc_setup_cbs(struct stmmac_priv *priv, return ret; priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB; + return 0; } /* Final adjustments for HW */ -- Gitee