From 7827e3acad2df1c6537e5fe7211d216dabc60399 Mon Sep 17 00:00:00 2001 From: Dongsheng Yang Date: Tue, 21 Jul 2015 16:30:20 +0800 Subject: mtd: mtdram: check offs and len in mtdram->erase We should prevent user to erasing mtd device with an unaligned offset or length. Signed-off-by: Dongsheng Yang Signed-off-by: Brian Norris --- drivers/mtd/devices/mtdram.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'drivers/mtd/devices') diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c index 8e285089229c..73fa297d81d2 100644 --- a/drivers/mtd/devices/mtdram.c +++ b/drivers/mtd/devices/mtdram.c @@ -32,8 +32,29 @@ MODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); // We could store these in the mtd structure, but we only support 1 device.. static struct mtd_info *mtd_info; +static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len) +{ + int ret = 0; + + /* Start address must align on block boundary */ + if (ofs % mtd->erasesize) { + pr_debug("%s: unaligned address\n", __func__); + ret = -EINVAL; + } + + /* Length must align on block boundary */ + if (len % mtd->erasesize) { + pr_debug("%s: length not block aligned\n", __func__); + ret = -EINVAL; + } + + return ret; +} + static int ram_erase(struct mtd_info *mtd, struct erase_info *instr) { + if (check_offs_len(mtd, instr->addr, instr->len)) + return -EINVAL; memset((char *)mtd->priv + instr->addr, 0xff, instr->len); instr->state = MTD_ERASE_DONE; mtd_erase_callback(instr); -- cgit v1.2.3