5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikko Rapeli <mikko.rapeli@xxxxxxxxxx> commit cf55a7acd1ed38afe43bba1c8a0935b51d1dc014 upstream. 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@xxxxxxx/ Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Mikko Rapeli <mikko.rapeli@xxxxxxxxxx> Reviewed-by: Avri Altman <avri.altman@xxxxxxx> Tested-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20240313133744.2405325-2-mikko.rapeli@xxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mmc/core/block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -468,7 +468,7 @@ static int __mmc_blk_ioctl_cmd(struct mm 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]; /*