bio_check_eod() should check partiton size not the whole disk if
bio->bi_partno is non-zero. Does this by taking the call to bio_check_eod
into blk_partition_remap.
Based on an earlier patch from Jiufei Xue.
Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index")
Reported-by: Jiufei Xue <jiufei.xue@xxxxxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/blk-core.c | 93 ++++++++++++++++++++++++--------------------------------
1 file changed, 40 insertions(+), 53 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 6d82c4f7fadd..47ee24611126 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2023,7 +2023,7 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
return BLK_QC_T_NONE;
}
-static void handle_bad_sector(struct bio *bio)
+static void handle_bad_sector(struct bio *bio, sector_t maxsector)
{
char b[BDEVNAME_SIZE];
@@ -2031,7 +2031,7 @@ static void handle_bad_sector(struct bio *bio)
printk(KERN_INFO "%s: rw=%d, want=%Lu, limit=%Lu\n",
bio_devname(bio, b), bio->bi_opf,
(unsigned long long)bio_end_sector(bio),
- (long long)get_capacity(bio->bi_disk));
+ (long long)maxsector);
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -2092,68 +2092,59 @@ static noinline int should_fail_bio(struct bio *bio)
}
ALLOW_ERROR_INJECTION(should_fail_bio, ERRNO);
+/*
+ * Check whether this bio extends beyond the end of the device or partition.
+ * This may well happen - the kernel calls bread() without checking the size of
+ * the device, e.g., when mounting a file system.
+ */
+static inline int bio_check_eod(struct bio *bio, sector_t maxsector)
+{
+ unsigned int nr_sectors = bio_sectors(bio);
+
+ if (nr_sectors && maxsector &&
+ (nr_sectors > maxsector ||
+ bio->bi_iter.bi_sector > maxsector - nr_sectors)) {
+ handle_bad_sector(bio, maxsector);
+ return -EIO;
+ }
+ return 0;
+}
+
/*
* Remap block n of partition p to block n+start(p) of the disk.
*/
static inline int blk_partition_remap(struct bio *bio)
{
struct hd_struct *p;
- int ret = 0;
+ int ret = -EIO;
rcu_read_lock();
p = __disk_get_part(bio->bi_disk, bio->bi_partno);
- if (unlikely(!p || should_fail_request(p, bio->bi_iter.bi_size) ||
- bio_check_ro(bio, p))) {
- ret = -EIO;
+ if (unlikely(!p))
+ goto out;
+ if (unlikely(should_fail_request(p, bio->bi_iter.bi_size)))
+ goto out;
+ if (unlikely(bio_check_ro(bio, p)))
goto out;
- }
/*
* Zone reset does not include bi_size so bio_sectors() is always 0.
* Include a test for the reset op code and perform the remap if needed.
*/
- if (!bio_sectors(bio) && bio_op(bio) != REQ_OP_ZONE_RESET)
- goto out;
-
- bio->bi_iter.bi_sector += p->start_sect;
- bio->bi_partno = 0;
- trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p),
- bio->bi_iter.bi_sector - p->start_sect);
-
+ if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET) {
+ if (bio_check_eod(bio, part_nr_sects_read(p)))
+ goto out;
+ bio->bi_iter.bi_sector += p->start_sect;
+ bio->bi_partno = 0;
+ trace_block_bio_remap(bio->bi_disk->queue, bio, part_devt(p),
+ bio->bi_iter.bi_sector - p->start_sect);
+ }
+ ret = 0;
out:
rcu_read_unlock();
return ret;
}
-/*
- * Check whether this bio extends beyond the end of the device.
- */
-static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)
-{
- sector_t maxsector;
-
- if (!nr_sectors)
- return 0;
-
- /* Test device or partition size, when known. */
- maxsector = get_capacity(bio->bi_disk);
- if (maxsector) {
- sector_t sector = bio->bi_iter.bi_sector;
-
- if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {
- /*
- * This may well happen - the kernel calls bread()
- * without checking the size of the device, e.g., when
- * mounting a device.
- */
- handle_bad_sector(bio);
- return 1;
- }
- }
-
- return 0;
-}
-
static noinline_for_stack bool
generic_make_request_checks(struct bio *bio)
{
@@ -2164,9 +2155,6 @@ generic_make_request_checks(struct bio *bio)
might_sleep();
- if (bio_check_eod(bio, nr_sectors))
- goto end_io;
-
q = bio->bi_disk->queue;
if (unlikely(!q)) {
printk(KERN_ERR
@@ -2186,17 +2174,16 @@ generic_make_request_checks(struct bio *bio)
if (should_fail_bio(bio))
goto end_io;
- if (!bio->bi_partno) {
- if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0)))
+ if (bio->bi_partno) {
+ if (unlikely(blk_partition_remap(bio)))
goto end_io;
} else {
- if (blk_partition_remap(bio))
+ if (unlikely(bio_check_ro(bio, &bio->bi_disk->part0)))
+ goto end_io;
+ if (unlikely(bio_check_eod(bio, get_capacity(bio->bi_disk))))
goto end_io;
}
- if (bio_check_eod(bio, nr_sectors))
- goto end_io;
-
/*
* Filter flush bio's early so that make_request based
* drivers without flush support don't have to worry
--
2.14.2
