Re: [PATCH V4] mtd: rawnand: qcom: fix memory corruption that causes panic

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On 4/18/2022 12:06 PM, Manivannan Sadhasivam wrote:
On Mon, Apr 18, 2022 at 11:53:11AM +0530, Md Sadre Alam wrote:
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>
Signed-off-by: Md Sadre Alam <quic_mdalam@xxxxxxxxxxx>
Signed-off-by: Sricharan R <quic_srichara@xxxxxxxxxxx>
I know that you and Sri were involved in creating this patch. So there should
be a co-developed-by tag for Sri and your signed-off-by should be the last one.
Like below,
    Updated in V5 patch.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6a3cec64f18c ("mtd: rawnand: qcom: convert driver to nand_scan()")
Reported-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxx>
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>

With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>


  Updated in V5 patch.


Thanks,
Mani

---
Changes in V4:

  * Incorporated "commit log wrong" comment from Mani
  * Updated commit log

Changes in V3:

  * Incorporated "Fixes tags are missing" comment from Miquèl
  * Added Fixes tag Fixes:6a3cec64f18c ("mtd: rawnand: qcom: convert driver to nand_scan()")
  * Incorporated "stable tag missing" comment from Miquèl
  * Added stable tag Cc: stable@xxxxxxxxxxxxxxx
  * Incorporated "Reported-by tag missing" comment from Mani
  * Added Reported-by tag Reported-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxx>

Changes in V2:

  * Incorporated "alloc_bam_transaction inside qcom_nand_attach_chip" suggestion from Mani
  * Freed previously alloacted memory for bam txn before updating max_cwperpage inside
    qcom_nand_attach_chip().
  * Moved alloc_bam_transaction() inside qcom_nand_attach_chip(). after upding max_cwperpage
    4 or 8 based on page size.

  drivers/mtd/nand/raw/qcom_nandc.c | 24 +++++++++++++-----------
  1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 1a77542..048b255 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);
--
2.7.4




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