libbpf: Fix realloc usage in bpf_core_find_cands

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commit 35b9211c0a upstream.

Fix bug requesting invalid size of reallocated array when constructing CO-RE
relocation candidate list. This can cause problems if there are many potential
candidates and a very fine-grained memory allocator bucket sizes are used.

Fixes: ddc7c30426 ("libbpf: implement BPF CO-RE offset relocation algorithm")
Reported-by: William Smith <williampsmith@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200124201847.212528-1-andriin@fb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Andrii Nakryiko 2020-01-24 12:18:46 -08:00 • committed by Greg Kroah-Hartman

parent 035e7fc142

commit b10e1adbc7

1 changed files with 3 additions and 1 deletions

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tools/lib/bpf/libbpf.c

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