[PATCH] mtd: Add check for kcalloc()

[Jiasheng Jiang]

Add a check for kcalloc() and print an error message if it fails.

Fixes: 78c08247b9d3 ("mtd: Support kmsg dumper based on pstore/blk")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool at gmail.com>
---
 drivers/mtd/mtdpstore.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index 7ac8ac901306..368997155c07 100644
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -423,6 +423,11 @@ static void mtdpstore_notify_add(struct mtd_info *mtd)
 	longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize));
 	cxt->badmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
 
+	if (!cxt->rmmap || !cxt->usedmap || !cxt->badmap) {
+		dev_err(&mtd->dev, "failed to allocate memory for map\n");
+		return;
+	}
+
 	/* just support dmesg right now */
 	cxt->dev.flags = PSTORE_FLAGS_DMESG;
 	cxt->dev.zone.read = mtdpstore_read;
-- 
2.25.1