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Groups > linux.kernel > #1400333
| From | James Bottomley <jejb@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: UBSAN: Undefined behaviour in drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 |
| Date | 2016-05-12 22:10 +0200 |
| Message-ID | <ry55M-4p6-11@gated-at.bofh.it> (permalink) |
| References | <ry1vb-ZS-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, 2016-05-12 at 19:02 +0300, Meelis Roos wrote: > This is from a dual-AthlonMP 32-bit x86 system with onboard Adaptec > SCSI > controller, once during bootup. > > [ 4.896307] > ===================================================================== > =========== > [ 4.896471] UBSAN: Undefined behaviour in > drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 > [ 4.896629] shift exponent -1 is negative Is this some sort of false positive? The shift in question is devinfo->target_mask = (0x01 << devinfo->target_offset); The code which calls this in ahc_linux_initialize_scsi_bus() looks to be looping from 0-16 (or variations). Since the value passed in is unsigned, it would have to be set to ~0, which doesn't seem possible. James
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UBSAN: Undefined behaviour in drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 Meelis Roos <mroos@linux.ee> - 2016-05-12 18:20 +0200
Re: UBSAN: Undefined behaviour in drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 James Bottomley <jejb@linux.vnet.ibm.com> - 2016-05-12 22:10 +0200
Re: UBSAN: Undefined behaviour in drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 Ilia Mirkin <imirkin@alum.mit.edu> - 2016-05-13 00:00 +0200
Re: UBSAN: Undefined behaviour in drivers/scsi/aic7xxx/aic7xxx_core.c:2831:31 James Bottomley <jejb@linux.vnet.ibm.com> - 2016-05-13 07:30 +0200
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