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IB/hfi1: Ensure dd->gi_mask can not be overflowed

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As the code stands today the array access in remap_intr() is OK. To
future proof the code though we should explicitly check to ensure the
index value is not outside of the valid range. This is not a straight
forward calculation so err on the side of caution.

Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dennis Dalessandro 2017-05-29 17:18:14 -07:00 committed by Doug Ledford
parent b2f8a04e77
commit bc54f6714c
1 changed files with 6 additions and 1 deletions
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7
drivers/infiniband/hw/hfi1/chip.c
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@ -12832,7 +12832,12 @@ static void remap_intr(struct hfi1_devdata *dd, int isrc, int msix_intr)
/* clear from the handled mask of the general interrupt */
m = isrc / 64;
n = isrc % 64;
dd->gi_mask[m] &= ~((u64)1 << n);
if (likely(m < CCE_NUM_INT_CSRS)) {
dd->gi_mask[m] &= ~((u64)1 << n);
} else {
dd_dev_err(dd, "remap interrupt err\n");
return;
}
/* direct the chip source to the given MSI-X interrupt */
m = isrc / 8;