https://bugs.dpdk.org/show_bug.cgi?id=979
Bug ID: 979
Summary: hash: invalid shift expression in rte_thash
Product: DPDK
Version: 21.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: vhost/virtio
Assignee: vladimir.medved...@intel.com
Reporter: david.march...@redhat.com
CC: dev@dpdk.org
Target Milestone: ---
This has been reported by covscan in our internal CI for v21.11:
2. dpdk-21.11/lib/hash/rte_thash.c:116: assignment: Assigning: "j" = "0".
4. dpdk-21.11/lib/hash/rte_thash.c:118: large_shift: In expression
"(uint16_t)rss_key[(i + 1) % size] >> 8 - j", right shifting "rss_key[(i + 1) %
size]" by more than 7 bits always yields zero. The shift amount, "8 - j", is 8.
# 116| for (j = 0; j < 8; j++) {
# 117| left_part = rss_key[i] << j;
# 118|-> right_part = (uint16_t)(rss_key[(i + 1) %
size]) >>
# 119| (8 - j);
# 120| m[i * 8 + j] = left_part|right_part;
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