From: Xingui Yang yangxingui@huawei.com
driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I7GRU1 CVE: NA
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If init debugfs failed and call debugfs_remove_recursive() when device register. We found it will trigger NULL point exception after calling debugfs_remove_recursive() again when device remove.
[ 1665.467244] hisi_sas_v3_hw 0000:b4:02.0: failed to init debugfs!
[ 1669.836708] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0 [ 1669.872669] pc : down_write+0x24/0x70 [ 1669.876315] lr : down_write+0x1c/0x70 [ 1669.879961] sp : ffff000036f53a30 [ 1669.883260] x29: ffff000036f53a30 x28: ffffa027c31549f8 [ 1669.888547] x27: ffffa027c3140000 x26: 0000000000000000 [ 1669.893834] x25: ffffa027bf37c270 x24: ffffa027bf37c270 [ 1669.899122] x23: ffff0000095406b8 x22: ffff0000095406a8 [ 1669.904408] x21: 0000000000000000 x20: ffffa027bf37c310 [ 1669.909695] x19: 00000000000000a0 x18: ffff8027dcd86f10 [ 1669.914982] x17: 0000000000000000 x16: 0000000000000000 [ 1669.920268] x15: 0000000000000000 x14: ffffa0274014f870 [ 1669.925555] x13: 0000000000000040 x12: 0000000000000228 [ 1669.930842] x11: 0000000000000020 x10: 0000000000000bb0 [ 1669.936129] x9 : ffff000036f537f0 x8 : ffff80273088ca10 [ 1669.941416] x7 : 000000000000001d x6 : 00000000ffffffff [ 1669.946702] x5 : ffff000008a36310 x4 : ffff80273088be00 [ 1669.951989] x3 : ffff000009513e90 x2 : 0000000000000000 [ 1669.957276] x1 : 00000000000000a0 x0 : ffffffff00000001 [ 1669.962563] Call trace: [ 1669.965000] down_write+0x24/0x70 [ 1669.968301] debugfs_remove_recursive+0x5c/0x1b0 [ 1669.972905] hisi_sas_debugfs_exit+0x24/0x30 [hisi_sas_main] [ 1669.978541] hisi_sas_v3_remove+0x130/0x150 [hisi_sas_v3_hw] [ 1669.984175] pci_device_remove+0x48/0xd8 [ 1669.988082] device_release_driver_internal+0x1b4/0x250 [ 1669.993282] device_release_driver+0x28/0x38 [ 1669.997534] pci_stop_bus_device+0x84/0xb8 [ 1670.001611] pci_stop_and_remove_bus_device_locked+0x24/0x40 [ 1670.007244] remove_store+0xfc/0x140 [ 1670.010802] dev_attr_store+0x44/0x60 [ 1670.014448] sysfs_kf_write+0x58/0x80 [ 1670.018095] kernfs_fop_write+0xe8/0x1f0 [ 1670.022000] __vfs_write+0x60/0x190 [ 1670.025472] vfs_write+0xac/0x1c0 [ 1670.028771] ksys_write+0x6c/0xd8 [ 1670.032071] __arm64_sys_write+0x24/0x30 [ 1670.035977] el0_svc_common+0x78/0x130 [ 1670.039710] el0_svc_handler+0x38/0x78 [ 1670.043442] el0_svc+0x8/0xc
To fix this by set debugfs_dir to NULL after call debugfs_remove_recursive().
Signed-off-by: Xingui Yang yangxingui@huawei.com Reviewed-by: kang fenglong kangfenglong@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/scsi/hisi_sas/hisi_sas_main.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index b00bf3b0f418..6bccd36556f2 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -3559,7 +3559,7 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
return; fail: - debugfs_remove_recursive(hisi_hba->debugfs_dir); + hisi_sas_debugfs_exit(hisi_hba); }
static void hisi_sas_debugfs_snapshot_regs(struct hisi_hba *hisi_hba) @@ -3741,14 +3741,15 @@ void hisi_sas_debugfs_init(struct hisi_hba *hisi_hba) devm_kfree(dev, hisi_hba->debugfs_port_reg[i]); devm_kfree(dev, hisi_hba->debugfs_global_reg); fail_global: - debugfs_remove_recursive(hisi_hba->debugfs_dir); - dev_dbg(dev, "failed to init debugfs!\n"); + hisi_sas_debugfs_exit(hisi_hba); + dev_info(dev, "failed to init debugfs!\n"); } EXPORT_SYMBOL_GPL(hisi_sas_debugfs_init);
void hisi_sas_debugfs_exit(struct hisi_hba *hisi_hba) { debugfs_remove_recursive(hisi_hba->debugfs_dir); + hisi_hba->debugfs_dir = NULL; } EXPORT_SYMBOL_GPL(hisi_sas_debugfs_exit);