On 10/21/2016 05:32 PM, Arnd Bergmann wrote:
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 <a...@arndb.de> --- drivers/scsi/sd_zbc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 16d3fa62d8ac..d5b3bd915d9e 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) {
Reviewed-by: Hannes Reinecke <h...@suse.com> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking h...@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)
