The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From ba7542eb2dd5dfc75c457198b88986642e602065 Mon Sep 17 00:00:00 2001
From: Md Sadre Alam <quic_mdalam@xxxxxxxxxxx>
Date: Mon, 18 Apr 2022 13:18:27 +0530
Subject: [PATCH] mtd: rawnand: qcom: fix memory corruption that causes panic
This patch fixes a memory corruption that occurred in the
nand_scan() path for Hynix nand device.
On boot, for Hynix nand device will panic at a weird place:
| Unable to handle kernel NULL pointer dereference at virtual
address 00000070
| [00000070] *pgd=00000000
| Internal error: Oops: 5 [#1] PREEMPT SMP ARM
| Modules linked in:
| CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.0-01473-g13ae1769cfb0
#38
| Hardware name: Generic DT based system
| PC is at nandc_set_reg+0x8/0x1c
| LR is at qcom_nandc_command+0x20c/0x5d0
| pc : [<c088b74c>] lr : [<c088d9c8>] psr: 00000113
| sp : c14adc50 ip : c14ee208 fp : c0cc970c
| r10: 000000a3 r9 : 00000000 r8 : 00000040
| r7 : c16f6a00 r6 : 00000090 r5 : 00000004 r4 :c14ee040
| r3 : 00000000 r2 : 0000000b r1 : 00000000 r0 :c14ee040
| Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
| Control: 10c5387d Table: 8020406a DAC: 00000051
| Register r0 information: slab kmalloc-2k start c14ee000 pointer offset
64 size 2048
| Process swapper/0 (pid: 1, stack limit = 0x(ptrval))
| nandc_set_reg from qcom_nandc_command+0x20c/0x5d0
| qcom_nandc_command from nand_readid_op+0x198/0x1e8
| nand_readid_op from hynix_nand_has_valid_jedecid+0x30/0x78
| hynix_nand_has_valid_jedecid from hynix_nand_init+0xb8/0x454
| hynix_nand_init from nand_scan_with_ids+0xa30/0x14a8
| nand_scan_with_ids from qcom_nandc_probe+0x648/0x7b0
| qcom_nandc_probe from platform_probe+0x58/0xac
The problem is that the nand_scan()'s qcom_nand_attach_chip callback
is updating the nandc->max_cwperpage from 1 to 4 or 8 based on page size.
This causes the sg_init_table of clear_bam_transaction() in the driver's
qcom_nandc_command() to memset much more than what was initially
allocated by alloc_bam_transaction().
This patch will update nandc->max_cwperpage 1 to 4 or 8 based on page
size in qcom_nand_attach_chip call back after freeing the previously
allocated memory for bam txn as per nandc->max_cwperpage = 1 and then
again allocating bam txn as per nandc->max_cwperpage = 4 or 8 based on
page size in qcom_nand_attach_chip call back itself.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6a3cec64f18c ("mtd: rawnand: qcom: convert driver to nand_scan()")
Reported-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Co-developed-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
Signed-off-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
Signed-off-by: Md Sadre Alam <quic_mdalam@xxxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/1650268107-5363-1-git-send-email-quic_mdalam@xxxxxxxxxxx
diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 1a77542c6d67..048b255faa76 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -2651,10 +2651,23 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
ecc->engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
+ /* Free the initially allocated BAM transaction for reading the ONFI params */
+ if (nandc->props->is_bam)
+ free_bam_transaction(nandc);
nandc->max_cwperpage = max_t(unsigned int, nandc->max_cwperpage,
cwperpage);
+ /* Now allocate the BAM transaction based on updated max_cwperpage */
+ if (nandc->props->is_bam) {
+ nandc->bam_txn = alloc_bam_transaction(nandc);
+ if (!nandc->bam_txn) {
+ dev_err(nandc->dev,
+ "failed to allocate bam transaction\n");
+ return -ENOMEM;
+ }
+ }
+
/*
* DATA_UD_BYTES varies based on whether the read/write command protects
* spare data with ECC too. We protect spare data by default, so we set
@@ -2955,17 +2968,6 @@ static int qcom_nand_host_init_and_register(struct qcom_nand_controller *nandc,
if (ret)
return ret;
- if (nandc->props->is_bam) {
- free_bam_transaction(nandc);
- nandc->bam_txn = alloc_bam_transaction(nandc);
- if (!nandc->bam_txn) {
- dev_err(nandc->dev,
- "failed to allocate bam transaction\n");
- nand_cleanup(chip);
- return -ENOMEM;
- }
- }
-
ret = mtd_device_parse_register(mtd, probes, NULL, NULL, 0);
if (ret)
nand_cleanup(chip);
