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| author |   Andrii Nakryiko <andriin@fb.com> | 2020-01-16 22:08:00 -0800 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-01-17 08:33:18 -0800 |
| commit | c701917e647c6aaee5e7bbb7a2c1ca99e8552c58 (patch) | |
| tree | ed0c7062d3151b9b6cfcb9707830726159069f84 /tools/lib | |
| parent | libbpf: Simplify BTF initialization logic (diff) | |
| download | linux-dev-c701917e647c6aaee5e7bbb7a2c1ca99e8552c58.tar.xz linux-dev-c701917e647c6aaee5e7bbb7a2c1ca99e8552c58.zip | |
libbpf: Fix potential multiplication overflow in mmap() size calculation
Prevent potential overflow performed in 32-bit integers, before assigning
result to size_t. Reported by LGTM static analysis.
Fixes: eba9c5f498a1 ("libbpf: Refactor global data map initialization")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200117060801.1311525-4-andriin@fb.com
Diffstat (limited to '')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 3b0b88c3377d..fc41c3f2e983 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1283,7 +1283,7 @@ static size_t bpf_map_mmap_sz(const struct bpf_map *map) long page_sz = sysconf(_SC_PAGE_SIZE); size_t map_sz; - map_sz = roundup(map->def.value_size, 8) * map->def.max_entries; + map_sz = (size_t)roundup(map->def.value_size, 8) * map->def.max_entries; map_sz = roundup(map_sz, page_sz); return map_sz; } |