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mtd: fix possible integer overflow in erase_xfer()

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The expression '1 << EraseUnitSize' is evaluated in int, which causes
a negative result when shifting by 31 - the upper bound of the valid
range [10, 31], enforced by scan_header(). This leads to incorrect
extension when storing the result in 'erase->len' (uint64_t), producing
a large unexpected value.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Ivan Stepchenko <sid@itb.spb.ru>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Ivan Stepchenko
2025-06-19 17:53:13 +03:00
committed by Miquel Raynal
parent d22d5f47ec
commit 9358bdb9f9
1 changed files with 1 additions and 1 deletions
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2
drivers/mtd/ftl.c
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@@ -344,7 +344,7 @@ static int erase_xfer(partition_t *part,
return -ENOMEM;
erase->addr = xfer->Offset;
erase->len = 1 << part->header.EraseUnitSize;
erase->len = 1ULL << part->header.EraseUnitSize;
ret = mtd_erase(part->mbd.mtd, erase);
if (!ret) {