mtd: Add check for devm_kcalloc()

[ Upstream commit 2aee30bb10d7bad0a60255059c9ce1b84cf0130e ]

Add a check for devm_kcalloc() to ensure successful allocation.

Fixes: 78c08247b9d3 ("mtd: Support kmsg dumper based on pstore/blk")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index 5594a22c0137543e12196fa7927c4703561b96f3..e86b6c9c44d30052db894a42b5f7197f25266b59 100644 (file)
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -423,6 +423,9 @@ static void mtdpstore_notify_add(struct mtd_info *mtd)
        longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize));
        cxt->badmap = devm_kcalloc(&mtd->dev, longcnt, sizeof(long), GFP_KERNEL);
 
+       if (!cxt->rmmap || !cxt->usedmap || !cxt->badmap)
+               return;
+
        cxt->dev.total_size = mtd->size;
        /* just support dmesg right now */
        cxt->dev.flags = PSTORE_FLAGS_DMESG;