From: Yihang Li <liyihang9@xxxxxxxxxx> [ Upstream commit 6de426f9276c448e2db7238911c97fb157cb23be ] If init debugfs failed during device registration due to memory allocation failure, debugfs_remove_recursive() is called, after which debugfs_dir is not set to NULL. debugfs_remove_recursive() will be called again during device removal. As a result, illegal pointer is accessed. [ 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, set debugfs_dir to NULL after debugfs_remove_recursive(). Signed-off-by: Yihang Li <liyihang9@xxxxxxxxxx> Signed-off-by: Xingui Yang <yangxingui@xxxxxxxxxx> Signed-off-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/1694571327-78697-2-git-send-email-chenxiang66@xxxxxxxxxxxxx Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index c0e74d768716d..c4305ec38ebf3 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -4717,6 +4717,12 @@ static void debugfs_bist_init_v3_hw(struct hisi_hba *hisi_hba) hisi_hba->debugfs_bist_linkrate = SAS_LINK_RATE_1_5_GBPS; } +static void debugfs_exit_v3_hw(struct hisi_hba *hisi_hba) +{ + debugfs_remove_recursive(hisi_hba->debugfs_dir); + hisi_hba->debugfs_dir = NULL; +} + static void debugfs_init_v3_hw(struct hisi_hba *hisi_hba) { struct device *dev = hisi_hba->dev; @@ -4740,18 +4746,13 @@ static void debugfs_init_v3_hw(struct hisi_hba *hisi_hba) for (i = 0; i < hisi_sas_debugfs_dump_count; i++) { if (debugfs_alloc_v3_hw(hisi_hba, i)) { - debugfs_remove_recursive(hisi_hba->debugfs_dir); + debugfs_exit_v3_hw(hisi_hba); dev_dbg(dev, "failed to init debugfs!\n"); break; } } } -static void debugfs_exit_v3_hw(struct hisi_hba *hisi_hba) -{ - debugfs_remove_recursive(hisi_hba->debugfs_dir); -} - static int hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id) { -- 2.42.0
