From cf55a7acd1ed38afe43bba1c8a0935b51d1dc014 Mon Sep 17 00:00:00 2001
From: Mikko Rapeli <mikko.rapeli@linaro.org>
Date: Wed, 13 Mar 2024 15:37:44 +0200
Subject: [PATCH] mmc: core: Avoid negative index with array access
Git-commit: cf55a7acd1ed38afe43bba1c8a0935b51d1dc014
Patch-mainline: v6.9-rc2
References: git-fixes
Commit 4d0c8d0aef63 ("mmc: core: Use mrq.sbc in close-ended ffu") assigns
prev_idata = idatas[i - 1], but doesn't check that the iterator i is
greater than zero. Let's fix this by adding a check.
Fixes: 4d0c8d0aef63 ("mmc: core: Use mrq.sbc in close-ended ffu")
Link: https://lore.kernel.org/all/20231129092535.3278-1-avri.altman@wdc.com/
Cc: stable@vger.kernel.org
Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240313133744.2405325-2-mikko.rapeli@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mmc/core/block.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 600adc3f2af4..90c51b12148e 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -488,7 +488,7 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
if (idata->flags & MMC_BLK_IOC_DROP)
return 0;
- if (idata->flags & MMC_BLK_IOC_SBC)
+ if (idata->flags & MMC_BLK_IOC_SBC && i > 0)
prev_idata = idatas[i - 1];
/*
--
2.43.0