From: Andrii Nakryiko Date: Fri, 4 Sep 2020 04:16:11 +0000 (-0700) Subject: libbpf: Fix potential multiplication overflow X-Git-Tag: v5.10.7~1401^2~169^2~54 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8eb629585d2231e90112148009e2a11b0979ca38;p=platform%2Fkernel%2Flinux-rpi.git libbpf: Fix potential multiplication overflow Detected by LGTM static analyze in Github repo, fix potential multiplication overflow before result is casted to size_t. Fixes: 8505e8709b5e ("libbpf: Implement generalized .BTF.ext func/line info adjustment") Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20200904041611.1695163-2-andriin@fb.com --- diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 53be32a..550950e 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5802,7 +5802,7 @@ static int adjust_prog_btf_ext_info(const struct bpf_object *obj, /* append func/line info of a given (sub-)program to the main * program func/line info */ - old_sz = (*prog_rec_cnt) * ext_info->rec_size; + old_sz = (size_t)(*prog_rec_cnt) * ext_info->rec_size; new_sz = old_sz + (copy_end - copy_start); new_prog_info = realloc(*prog_info, new_sz); if (!new_prog_info)