The unsigned 32 bits overflow check for the zone size value is already
done within sd_zbc_check_zones() with the test:
} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
so there is no need to check again for an out of range value in
sd_zbc_read_zones(). Simplify the code and fix sd_zbc_check_zones()
error return to -EFBIG instead of -ENODEV if the zone size is too large.
Change the return type of sd_zbc_check_zones() to an int for the error
code and return the zone size (zone_blocks) through a u32 pointer to
avoid overflowing the signed 32 return value.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
drivers/scsi/sd_zbc.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index ca73c46931c0..0678e1e108b0 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -373,7 +373,7 @@ static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
* Returns the zone size in number of blocks upon success or an error code
* upon failure.
*/
-static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
+static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
{
u64 zone_blocks = 0;
sector_t max_lba, block = 0;
@@ -381,7 +381,7 @@ static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
unsigned char *rec;
unsigned int buf_len;
unsigned int list_length;
- s64 ret;
+ int ret;
u8 same;
/* Get a buffer */
@@ -472,9 +472,10 @@ static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Zone size too large\n");
- ret = -ENODEV;
+ ret = -EFBIG;
} else {
- ret = zone_blocks;
+ *zblocks = zone_blocks;
+ ret = 0;
}
out_free:
@@ -668,7 +669,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)
int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
{
- int64_t zone_blocks;
+ u32 zone_blocks;
int ret;
if (!sd_is_zoned(sdkp))
@@ -687,12 +688,8 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
* Check zone size: only devices with a constant zone size (except
* an eventual last runt zone) that is a power of 2 are supported.
*/
- zone_blocks = sd_zbc_check_zones(sdkp);
- ret = -EFBIG;
- if (zone_blocks != (u32)zone_blocks)
- goto err;
- ret = zone_blocks;
- if (ret < 0)
+ ret = sd_zbc_check_zones(sdkp, &zone_blocks);
+ if (ret != 0)
goto err;
/* The drive satisfies the kernel restrictions: set it up */
--
2.17.1
