netdev - [PATCH net 2/2] bnxt_en: Fix potential crash when dumping FW log coredump

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Message-ID: <20241204215918.1692597-3-michael.chan@broadcom.com>
Date: Wed,  4 Dec 2024 13:59:18 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com,
	Hongguang Gao <hongguang.gao@...adcom.com>
Subject: [PATCH net 2/2] bnxt_en: Fix potential crash when dumping FW log coredump

From: Hongguang Gao <hongguang.gao@...adcom.com>

If the FW log context memory is retained after FW reset, the existing
code is not handling the condition correctly and zeroes out the data
structures.  This potentially will cause a division by zero crash
when the user runs ethtool -w.  The last_type is also not set
correctly when the context memory is retained.  This will cause errors
because the last_type signals to the FW that all context memory types
have been configured.

Oops: divide error: 0000 1 PREEMPT SMP NOPTI
CPU: 53 UID: 0 PID: 7019 Comm: ethtool Kdump: loaded Tainted: G           OE      6.12.0-rc7+ #1
Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
Hardware name: Supermicro SYS-621C-TN12R/X13DDW-A, BIOS 1.4 08/10/2023
RIP: 0010:__bnxt_copy_ctx_mem.constprop.0.isra.0+0x86/0x160 [bnxt_en]
Code: 0a 31 d2 4c 89 6c 24 10 45 8b a5 fc df ff ff 4c 8b 74 24 20 31 db 66 89 44 24 06 48 63 c5 c1 e5 09 4c 0f af e0 48 8b 44 24 30 <49> f7 f4 4c 89 64 24 08 48 63 c5 4d 89 ec 31 ed 48 89 44 24 18 49
RSP: 0018:ff480591603d78b8 EFLAGS: 00010206
RAX: 0000000000100000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ff23959e46740000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000100000 R09: ff23959e46740000
R10: ff480591603d7a18 R11: 0000000000000010 R12: 0000000000000000
R13: ff23959e46742008 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f04227c1740(0000) GS:ff2395adbf680000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f04225b33a5 CR3: 000000108b9a4001 CR4: 0000000000773ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 ? die+0x33/0x90
 ? do_trap+0xd9/0x100
 ? __bnxt_copy_ctx_mem.constprop.0.isra.0+0x86/0x160 [bnxt_en]
 ? do_error_trap+0x65/0x80
 ? __bnxt_copy_ctx_mem.constprop.0.isra.0+0x86/0x160 [bnxt_en]
 ? exc_divide_error+0x36/0x50
 ? __bnxt_copy_ctx_mem.constprop.0.isra.0+0x86/0x160 [bnxt_en]
 ? asm_exc_divide_error+0x16/0x20
 ? __bnxt_copy_ctx_mem.constprop.0.isra.0+0x86/0x160 [bnxt_en]
 ? __bnxt_copy_ctx_mem.constprop.0.isra.0+0xda/0x160 [bnxt_en]
 bnxt_get_ctx_coredump.constprop.0+0x1ed/0x390 [bnxt_en]
 ? __memcg_slab_post_alloc_hook+0x21c/0x3c0
 ? __bnxt_get_coredump+0x473/0x4b0 [bnxt_en]
 __bnxt_get_coredump+0x473/0x4b0 [bnxt_en]
 ? security_file_alloc+0x74/0xe0
 ? cred_has_capability.isra.0+0x78/0x120
 bnxt_get_coredump_length+0x4b/0xf0 [bnxt_en]
 bnxt_get_dump_flag+0x40/0x60 [bnxt_en]
 __dev_ethtool+0x17e4/0x1fc0
 ? syscall_exit_to_user_mode+0xc/0x1d0
 ? do_syscall_64+0x85/0x150
 ? unmap_page_range+0x299/0x4b0
 ? vma_interval_tree_remove+0x215/0x2c0
 ? __kmalloc_cache_noprof+0x10a/0x300
 dev_ethtool+0xa8/0x170
 dev_ioctl+0x1b5/0x580
 ? sk_ioctl+0x4a/0x110
 sock_do_ioctl+0xab/0xf0
 sock_ioctl+0x1ca/0x2e0
 __x64_sys_ioctl+0x87/0xc0
 do_syscall_64+0x79/0x150

Fixes: 24d694aec139 ("bnxt_en: Allocate backing store memory for FW trace logs")
Signed-off-by: Hongguang Gao <hongguang.gao@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 79f2d56d7bc8..a96190dde70e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8318,7 +8318,7 @@ static int bnxt_alloc_all_ctx_pg_info(struct bnxt *bp, int ctx_max)
 		struct bnxt_ctx_mem_type *ctxm = &ctx->ctx_arr[type];
 		int n = 1;
 
-		if (!ctxm->max_entries)
+		if (!ctxm->max_entries || ctxm->pg_info)
 			continue;
 
 		if (ctxm->instance_bmap)
@@ -8922,8 +8922,8 @@ static int bnxt_backing_store_cfg_v2(struct bnxt *bp, u32 ena)
 				continue;
 			}
 			bnxt_bs_trace_init(bp, ctxm);
-			last_type = type;
 		}
+		last_type = type;
 	}
 
 	if (last_type == BNXT_CTX_INV) {
-- 
2.30.1