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| author | Arnd Bergmann <arnd@arndb.de> | 2016-10-21 17:32:24 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-10-24 20:52:23 -0600 |
| commit | 5f2808ff1582202175d3908973eb9e05a5e6625d (patch) | |
| tree | afb8b61be61b76362121cfc18502821d96264325 | |
| parent | 3c4da75814c4b8871116940eb32d3a5243026918 (diff) | |
| download | linux-0-day-5f2808ff1582202175d3908973eb9e05a5e6625d.tar.gz linux-0-day-5f2808ff1582202175d3908973eb9e05a5e6625d.tar.xz | |
sd: fix uninitialized variable access in error handling
If sd_zbc_report_zones fails, the check for 'zone_blocks == 0'
later in the function accesses uninitialized data:
drivers/scsi/sd_zbc.c: In function ‘sd_zbc_read_zones’:
drivers/scsi/sd_zbc.c:520:7: error: ‘zone_blocks’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
This sets it to zero, which has the desired effect of leaving
the sd_zbc_read_zones successfully with sdkp->zone_blocks = 0.
Fixes: 89d947561077 ("sd: Implement support for ZBC devices")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/scsi/sd_zbc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 16d3fa62d8acb..d5b3bd915d9eb 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -455,8 +455,10 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp) /* Do a report zone to get the same field */ ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0); - if (ret) + if (ret) { + zone_blocks = 0; goto out; + } same = buf[4] & 0x0f; if (same > 0) { |