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libbpf: Fix potential multiplication overflow

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Detected by LGTM static analyze in Github repo, fix potential multiplication
overflow before result is casted to size_t.

Fixes: 8505e8709b ("libbpf: Implement generalized .BTF.ext func/line info adjustment")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200904041611.1695163-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-09-03 21:16:11 -07:00 committed by Daniel Borkmann
parent 17e54b096e
commit 8eb629585d
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/libbpf.c
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@ -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)