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libbpf: Fix hypothetical STT_SECTION extern NULL deref case

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[ Upstream commit e0525cd72b5979d8089fe524a071ea93fd011dc9 ]

Fix theoretical NULL dereference in linker when resolving *extern*
STT_SECTION symbol against not-yet-existing ELF section. Not sure if
it's possible in practice for valid ELF object files (this would require
embedded assembly manipulations, at which point BTF will be missing),
but fix the s/dst_sym/dst_sec/ typo guarding this condition anyways.

Fixes: faf6ed321c ("libbpf: Add BPF static linker APIs")
Fixes: a46349227c ("libbpf: Add linker extern resolution support for functions and global variables")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20250220002821.834400-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrii Nakryiko
2025-02-19 16:28:21 -08:00
committed by Greg Kroah-Hartman
parent 5db897802c
commit b55c470275
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/linker.c
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@@ -1974,7 +1974,7 @@ add_sym:
obj->sym_map[src_sym_idx] = dst_sym_idx;
if (sym_type == STT_SECTION && dst_sym) {
if (sym_type == STT_SECTION && dst_sec) {
dst_sec->sec_sym_idx = dst_sym_idx;
dst_sym->st_value = 0;
}