From: Riyan Dhiman riyandhiman14@gmail.com

stable inclusion from stable-v5.10.227 commit 4bc4272e2506941c3f3d4fb8b0c659ee814dcf6f category: bugifx bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYPJH CVE: CVE-2024-47705

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 26e197b7f9240a4ac301dd0ad520c0c697c2ea7d ]

The blk_add_partition() function initially used a single if-condition (IS_ERR(part)) to check for errors when adding a partition. This was modified to handle the specific case of -ENXIO separately, allowing the function to proceed without logging the error in this case. However, this change unintentionally left a path where md_autodetect_dev() could be called without confirming that part is a valid pointer.

This commit separates the error handling logic by splitting the initial if-condition, improving code readability and handling specific error scenarios explicitly. The function now distinguishes the general error case from -ENXIO without altering the existing behavior of md_autodetect_dev() calls.

Fixes: b72053072c0b (block: allow partitions on host aware zone devices) Signed-off-by: Riyan Dhiman riyandhiman14@gmail.com Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20240911132954.5874-1-riyandhiman14@gmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org

Conflicts: block/partitions/core.c [Context inconsistency.] Signed-off-by: Zheng Qixing zhengqixing@huawei.com --- block/partitions/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/partitions/core.c b/block/partitions/core.c index 8e0bddf0fa51..7e1fd93a5634 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -705,9 +705,11 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev,

part = add_partition(disk, p, from, size, state->parts[p].flags, &state->parts[p].info); - if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { - printk(KERN_ERR " %s: p%d could not be added: %ld\n", - disk->disk_name, p, -PTR_ERR(part)); + if (IS_ERR(part)) { + if (PTR_ERR(part) != -ENXIO) { + printk(KERN_ERR " %s: p%d could not be added: %ld\n", + disk->disk_name, p, -PTR_ERR(part)); + } return true; }