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author | 2021-02-11 19:46:43 +0100 | |
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committer | 2021-02-15 16:17:14 +0000 | |
commit | 1a3e08a7197addb1c07e66c1b1da3286c9bcb140 (patch) | |
tree | fcbb03afc8aa57d3c9c63a7cdf5a27d0c24cf502 /src/vnet/ip | |
parent | ce3f8249b59d3c3540cf0b87cc1c2f0d3a3a1814 (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>
Diffstat (limited to 'src/vnet/ip')
0 files changed, 0 insertions, 0 deletions