[PATCH 3.2 71/95] scsi: sd: Fix capacity calculation with 32-bit sector_t

From: Ben Hutchings
Date: Sun Jul 16 2017 - 11:01:11 EST


3.2.91-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>

commit 7c856152cb92f8eee2df29ef325a1b1f43161aff upstream.

We previously made sure that the reported disk capacity was less than
0xffffffff blocks when the kernel was not compiled with large sector_t
support (CONFIG_LBDAF). However, this check assumed that the capacity
was reported in units of 512 bytes.

Add a sanity check function to ensure that we only enable disks if the
entire reported capacity can be expressed in terms of sector_t.

Reported-by: Steve Magnani <steve.magnani@xxxxxxxxxxxxxxx>
Cc: Bart Van Assche <Bart.VanAssche@xxxxxxxxxxx>
Reviewed-by: Bart Van Assche <Bart.VanAssche@xxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
[bwh: Backported to 3.2: use integer literal instead of U32_MAX]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/scsi/sd.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1648,6 +1648,22 @@ static void read_capacity_error(struct s

#define READ_CAPACITY_RETRIES_ON_RESET 10

+/*
+ * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
+ * and the reported logical block size is bigger than 512 bytes. Note
+ * that last_sector is a u64 and therefore logical_to_sectors() is not
+ * applicable.
+ */
+static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
+{
+ u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
+
+ if (sizeof(sector_t) == 4 && last_sector > 0xffffffffULL)
+ return false;
+
+ return true;
+}
+
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
unsigned char *buffer)
{
@@ -1710,7 +1726,7 @@ static int read_capacity_16(struct scsi_

sd_read_protection_type(sdkp, buffer);

- if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
+ if (!sd_addressable_capacity(lba, sector_size)) {
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
"kernel compiled with support for large block "
"devices.\n");
@@ -1796,7 +1812,7 @@ static int read_capacity_10(struct scsi_
return sector_size;
}

- if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
+ if (!sd_addressable_capacity(lba, sector_size)) {
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
"kernel compiled with support for large block "
"devices.\n");