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bpf: btf: Fix vsnprintf return value check 

Bugzilla: https://bugzilla.redhat.com/2137876

commit 58250ae350de8d28ce91ade4605d32c9e7f062a8
Author: Fedor Tokarev <ftokarev@gmail.com>
Date:   Mon Jul 11 23:13:17 2022 +0200

    bpf: btf: Fix vsnprintf return value check
    
    vsnprintf returns the number of characters which would have been written if
    enough space had been available, excluding the terminating null byte. Thus,
    the return value of 'len_left' means that the last character has been
    dropped.
    
    Signed-off-by: Fedor Tokarev <ftokarev@gmail.com>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Acked-by: Alan Maguire <alan.maguire@oracle.com>
    Link: https://lore.kernel.org/bpf/20220711211317.GA1143610@laptop

Signed-off-by: Artem Savkov <asavkov@redhat.com>
This commit is contained in:
Artem Savkov 2022-10-31 15:44:14 +01:00
parent ee0991e7ce
commit cb6acbdffd
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/btf.c
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@ -6643,7 +6643,7 @@ static void btf_snprintf_show(struct btf_show *show, const char *fmt,
if (len < 0) {
ssnprintf->len_left = 0;
ssnprintf->len = len;
} else if (len > ssnprintf->len_left) {
} else if (len >= ssnprintf->len_left) {
/* no space, drive on to get length we would have written */
ssnprintf->len_left = 0;
ssnprintf->len += len;