mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()

stable inclusion
from stable-v5.10.190
commit 1f09d67d390647f83f8f9d26382b0daa43756e6f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f09d67d390647f83f8f9d26382b0daa43756e6f



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[ Upstream commit c6abce60 ]

'op-cs' is copied in 'fun->mchip_number' which is used to access the
'mchip_offsets' and the 'rnb_gpio' arrays.
These arrays have NAND_MAX_CHIPS elements, so the index must be below this
limit.

Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This
would lead to out-of-bound accesses.

Fixes: 54309d65 ("mtd: rawnand: fsl_upm: Implement exec_op()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/cd01cba1c7eda58bdabaae174c78c067325803d2.1689803636.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>