linux-kernel - [PATCH] mtd: nand: qpic_common: use {cmd,data}_sgl_nitems for sg_init

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Message-Id: <20250811-qpic_common-sgl-nitems-v1-1-a71b5ece54ab@gmail.com>
Date: Mon, 11 Aug 2025 10:30:42 +0200
From: Gabor Juhos <j4g8y7@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Gabor Juhos <j4g8y7@...il.com>
Subject: [PATCH] mtd: nand: qpic_common: use {cmd,data}_sgl_nitems for
 sg_init_table()

Since commit ddaad4ad774d ("mtd: nand: qpic_common: prevent out of
bounds access of BAM arrays"), the {cmd,data}_sgl_nitems members in
the 'bam_transaction' structure are containing the number of elements
in the cmd/data scatter-gather lists.

Change the qcom_clear_bam_transaction() function to use these numbers
while reinitializing the sg lists instead of recomputing the number of
elements to make it less error prone.

Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
---
 drivers/mtd/nand/qpic_common.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/qpic_common.c b/drivers/mtd/nand/qpic_common.c
index 8e604cc22ca310159edf4d8dbc2f6a82d5119eb4..db6c46a6fe01c71e8bb0379eb1f289c7e56701c9 100644
--- a/drivers/mtd/nand/qpic_common.c
+++ b/drivers/mtd/nand/qpic_common.c
@@ -89,10 +89,8 @@ void qcom_clear_bam_transaction(struct qcom_nand_controller *nandc)
 	memset(&bam_txn->bam_positions, 0, sizeof(bam_txn->bam_positions));
 	bam_txn->last_data_desc = NULL;
 
-	sg_init_table(bam_txn->cmd_sgl, nandc->max_cwperpage *
-		      QPIC_PER_CW_CMD_SGL);
-	sg_init_table(bam_txn->data_sgl, nandc->max_cwperpage *
-		      QPIC_PER_CW_DATA_SGL);
+	sg_init_table(bam_txn->cmd_sgl, bam_txn->cmd_sgl_nitems);
+	sg_init_table(bam_txn->data_sgl, bam_txn->data_sgl_nitems);
 
 	reinit_completion(&bam_txn->txn_done);
 }

---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250809-qpic_common-sgl-nitems-9ce54a6d0c25

Best regards,
-- 
Gabor Juhos <j4g8y7@...il.com>