From: Richard Weinberger richard@nod.at

mainline inclusion from mainline-v6.9-rc1 commit 68a24aba7c593eafa8fd00f2f76407b9b32b47a9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I91L79 CVE: CVE-2024-25739

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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If the LEB size is smaller than a volume table record we cannot have volumes. In this case abort attaching.

Cc: Chenyuan Yang cy54@illinois.edu Cc: stable@vger.kernel.org Fixes: 801c135ce73d ("UBI: Unsorted Block Images") Reported-by: Chenyuan Yang cy54@illinois.edu Closes: https://lore.kernel.org/linux-mtd/1433EB7A-FC89-47D6-8F47-23BE41B263B3@illin... Signed-off-by: Richard Weinberger richard@nod.at Reviewed-by: Zhihao Cheng chengzhihao1@huawei.com Signed-off-by: ZhaoLong Wang wangzhaolong1@huawei.com --- drivers/mtd/ubi/vtbl.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c index f700f0e4f2ec..6e5489e233dd 100644 --- a/drivers/mtd/ubi/vtbl.c +++ b/drivers/mtd/ubi/vtbl.c @@ -791,6 +791,12 @@ int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai) * The number of supported volumes is limited by the eraseblock size * and by the UBI_MAX_VOLUMES constant. */ + + if (ubi->leb_size < UBI_VTBL_RECORD_SIZE) { + ubi_err(ubi, "LEB size too small for a volume record"); + return -EINVAL; + } + ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE; if (ubi->vtbl_slots > UBI_MAX_VOLUMES) ubi->vtbl_slots = UBI_MAX_VOLUMES;