mtd: cfi_cmdset_0001: fixing memory leak and handling failed kmalloc

kmalloc needs to be handled when failing in memory pressure.
Also, it has memory leak in error routine.

Signed-off-by: Insu Yun <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/chips/cfi_cmdset_0001.c

···
 	mtd->size = devsize * cfi->numchips;
 
 	mtd->numeraseregions = cfi->cfiq->NumEraseRegions * cfi->numchips;
-	mtd->eraseregions = kmalloc(sizeof(struct mtd_erase_region_info)
+	mtd->eraseregions = kzalloc(sizeof(struct mtd_erase_region_info)
 			* mtd->numeraseregions, GFP_KERNEL);
 	if (!mtd->eraseregions)
 		goto setup_err;
···
 			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].erasesize = ersize;
 			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].numblocks = ernum;
 			mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].lockmap = kmalloc(ernum / 8 + 1, GFP_KERNEL);
+			if (!mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].lockmap)
+				goto setup_err;
 		}
 		offset += (ersize * ernum);
 	}
···
 	return mtd;
 
  setup_err:
+	if (mtd->eraseregions)
+		for (i=0; i<cfi->cfiq->NumEraseRegions; i++)
+			for (j=0; j<cfi->numchips; j++)
+				kfree(mtd->eraseregions[(j*cfi->cfiq->NumEraseRegions)+i].lockmap);
 	kfree(mtd->eraseregions);
 	kfree(mtd);
 	kfree(cfi->cmdset_priv);