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authorBenoît Ganne <bganne@cisco.com>2021-02-11 19:46:43 +0100
committerDamjan Marion <dmarion@me.com>2021-02-15 16:17:14 +0000
commit1a3e08a7197addb1c07e66c1b1da3286c9bcb140 (patch)
treefcbb03afc8aa57d3c9c63a7cdf5a27d0c24cf502 /LICENSE
parentce3f8249b59d3c3540cf0b87cc1c2f0d3a3a1814 (diff)
vppinfra: fix memcpy undefined behaviour
Calling mem{cpy,move} with NULL pointers results in undefined behaviour. This in turns is exploited by GCC. For example, the sequence: memcpy (dst, src, n); if (!src) return; src[0] = 0xcafe; will be optimized as memcpy (dst, src, n); src[0] = 0xcafe; IOW the test for NULL is gone. vec_*() functions sometime call memcpy with NULL pointers and 0 length, triggering this optimization. For example, the sequence: vec_append(v1, v2); len = vec_len(v2); will crash if v2 is NULL, because the test for NULL pointer in vec_len() has been optimized out. This commit fixes occurrences of such undefined behaviour, and also introduces a memcpy wrapper to catch those in debug mode. Type: fix Change-Id: I175e2dd726a883f97cf7de3b15f66d4b237ddefd Signed-off-by: Benoît Ganne <bganne@cisco.com>
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