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authorDavid Gibson <david@gibson.dropbear.id.au>2024-02-20 13:48:24 +1100
committerStefano Brivio <sbrivio@redhat.com>2024-02-20 08:14:28 +0100
commit1e6f92b995a9f7bff83b8b7a4b51782804fc23c5 (patch)
tree297c06c76fea753d224c18606c2af3e84c32b5fb /passt.c
parent8954c4a91b98b734797c3d1292d6635d917fa4d8 (diff)
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udp: Fix 16-bit overflow in udp_invert_portmap()2024_02_20.1e6f92b
The code in udp_invert_portmap() is written based on an incorrect understanding of C's (arcane) integer promotion rules. We calculate '(in_port_t)i + delta' expecting the result to be of type in_port_t (16 bits). However "small integer types" (those narrower than 'int') are always promoted to int for expressions, meaning this calculation can overrun the rdelta[] array. Fix this, and use a new intermediate for the index, to make it very clear what it's type is. We also change i to unsigned, to avoid any possible confusion from mixing signed and unsigned types. Link: https://bugs.passt.top/show_bug.cgi?id=80 Reported-by: Laurent Jacquot <jk@lutty.net> Suggested-by: Laurent Jacquot <jk@lutty.net> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'passt.c')
0 files changed, 0 insertions, 0 deletions