From 83a7f27c5b94e43f29f8216a32790751139aa61e Mon Sep 17 00:00:00 2001 From: Hariprasad Kelam Date: Wed, 3 May 2023 12:39:38 +0530 Subject: [PATCH] octeontx2-af: Add validation for lmac type [ Upstream commit cb5edce271764524b88b1a6866b3e626686d9a33 ] Upon physical link change, firmware reports to the kernel about the change along with the details like speed, lmac_type_id, etc. Kernel derives lmac_type based on lmac_type_id received from firmware. In a few scenarios, firmware returns an invalid lmac_type_id, which is resulting in below kernel panic. This patch adds the missing validation of the lmac_type_id field. Internal error: Oops: 96000005 [#1] PREEMPT SMP [ 35.321595] Modules linked in: [ 35.328982] CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted 5.4.210-g2e3169d8e1bc-dirty #17 [ 35.337014] Hardware name: Marvell CN103XX board (DT) [ 35.344297] Workqueue: events work_for_cpu_fn [ 35.352730] pstate: 40400089 (nZcv daIf +PAN -UAO) [ 35.360267] pc : strncpy+0x10/0x30 [ 35.366595] lr : cgx_link_change_handler+0x90/0x180 Fixes: 61071a871ea6 ("octeontx2-af: Forward CGX link notifications to PFs") Signed-off-by: Hariprasad Kelam Signed-off-by: Sunil Kovvuri Goutham Signed-off-by: Sai Krishna Reviewed-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c index 8fdd3afe59981..afdddfced7e69 100644 --- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c +++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c @@ -1225,6 +1225,14 @@ static inline void link_status_user_format(u64 lstat, linfo->an = FIELD_GET(RESP_LINKSTAT_AN, lstat); linfo->fec = FIELD_GET(RESP_LINKSTAT_FEC, lstat); linfo->lmac_type_id = cgx_get_lmac_type(cgx, lmac_id); + + if (linfo->lmac_type_id >= LMAC_MODE_MAX) { + dev_err(&cgx->pdev->dev, "Unknown lmac_type_id %d reported by firmware on cgx port%d:%d", + linfo->lmac_type_id, cgx->cgx_id, lmac_id); + strncpy(linfo->lmac_type, "Unknown", LMACTYPE_STR_LEN - 1); + return; + } + lmac_string = cgx_lmactype_string[linfo->lmac_type_id]; strncpy(linfo->lmac_type, lmac_string, LMACTYPE_STR_LEN - 1); }