https://bugs.dpdk.org/show_bug.cgi?id=345
Bug ID: 345
Summary: rte_hash returns invalid key if the number of entries
is not a power of 2
Product: DPDK
Version: 19.08
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: other
Assignee: dev@dpdk.org
Reporter: barbe...@kth.se
Target Milestone: ---
Hi all,
rte_hash_create will silently augment the number of entries (N) to the next
power of 2 value.
Per the documentation, the return values of "rte_hash_lookup" or "rte_hash_add"
is "[... or] a positive value that can be used by the caller as an offset into
an array of user data. This value is unique for this key.".
Which may lead to a segmentation fault, as the user allocated only N entries
and not next_pow2(N). And there is no means to recover what is the "final"
number of entries (next_pow2(N)).
I would suggest to at least update the documentation. One way to really fix
this would be to let the user get the actual number of entries, or fail if the
value is not a power of 2.
Tom
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