Hi Martin,
The patch fe542396da73: "[SCSI] sd: Ensure we correctly disable
devices with unknown protection type" from Sep 21, 2012, leads to the
following warning:
include/scsi/scsi_host.h:879 scsi_host_dif_capable()
warn: buffer overflow 'cap' 4 <= 4
838 enum scsi_host_prot_capabilities {
839 SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */
840 SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */
841 SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */
842
843 SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA
only */
844 SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */
845 SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */
846 SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */
847 };
869 static inline unsigned int scsi_host_dif_capable(struct Scsi_Host
*shost, unsigned int target_type)
870 {
871 static unsigned char cap[] = { 0,
872 SHOST_DIF_TYPE1_PROTECTION,
873 SHOST_DIF_TYPE2_PROTECTION,
874 SHOST_DIF_TYPE3_PROTECTION };
875
876 if (target_type > SHOST_DIF_TYPE3_PROTECTION)
877 return 0;
878
879 return shost->prot_capabilities & cap[target_type] ?
target_type : 0;
^^^^^^^^^^^^^^^^
It looks like we're doing cap[1 << 2] here not cap[2].
880 }
882 static inline unsigned int scsi_host_dix_capable(struct Scsi_Host
*shost, unsigned int target_type)
883 {
884 #if defined(CONFIG_BLK_DEV_INTEGRITY)
885 static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION,
886 SHOST_DIX_TYPE1_PROTECTION,
887 SHOST_DIX_TYPE2_PROTECTION,
888 SHOST_DIX_TYPE3_PROTECTION };
889
890 if (target_type > SHOST_DIX_TYPE3_PROTECTION)
891 return 0;
892
893 return shost->prot_capabilities & cap[target_type];
^^^^^^^^^^^^^^^^^
We're doing cap[1 << 6] here, not cap[6];
894 #endif
895 return 0;
896 }
regards,
dan carpenter
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