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libbpf: preserve errno before calling into user callback

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pr_warning ultimately may call into user-provided callback function,
which can clobber errno value, so we need to save it before that.

Acked-by: Song Liu <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Andrii Nakryiko authored and Daniel Borkmann committed 2019-05-30 01:23:34 +02:00
1 parent 8ca990ce0d
commit be5c5d4e9d
1 file changed
+4 -4
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tools/lib/bpf/libbpf.c
+4 -4
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@@ -565,12 +565,12 @@ static int bpf_object__elf_init(struct bpf_object *obj)
} else {
obj->efile.fd = open(obj->path, O_RDONLY);
if (obj->efile.fd < 0) {
char errmsg[STRERR_BUFSIZE];
char *cp = libbpf_strerror_r(errno, errmsg,
sizeof(errmsg));
char errmsg[STRERR_BUFSIZE], *cp;
err = -errno;
cp = libbpf_strerror_r(err, errmsg, sizeof(errmsg));
pr_warning("failed to open %s: %s\n", obj->path, cp);
return -errno;
return err;
}
obj->efile.elf = elf_begin(obj->efile.fd,