mmc: core: Avoid negative index with array access

Commit 4d0c8d0 ("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: 4d0c8d0 ("mmc: core: Use mrq.sbc in close-ended ffu")
Link: https://lore.kernel.org/all/[email protected]/
Cc: [email protected]
Signed-off-by: Mikko Rapeli <[email protected]>
Reviewed-by: Avri Altman <[email protected]>
Tested-by: Francesco Dolcini <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: mikkorapeli-linaro

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];
 
 	/*