commit 9bf4a9e18a244dd9930a906e92d1f33bbc3bbf13 Author: David Goulet dgoulet@torproject.org Date: Tue Feb 8 09:30:50 2022 -0500

nss: Don't write empty payload on the wire

Part of #40548

Signed-off-by: David Goulet dgoulet@torproject.org --- src/lib/tls/tortls_nss.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/src/lib/tls/tortls_nss.c b/src/lib/tls/tortls_nss.c index b1007c6218..392747e930 100644 --- a/src/lib/tls/tortls_nss.c +++ b/src/lib/tls/tortls_nss.c @@ -588,6 +588,10 @@ tor_tls_write(tor_tls_t *tls, const char *cp, size_t n) tor_assert(cp || n == 0); tor_assert(n < INT_MAX);

+ if (n == 0) { + return 0; + } + PRInt32 rv = PR_Write(tls->ssl, cp, (int)n); // log_debug(LD_NET, "PR_Write(%zu) returned %d", n, (int)rv); if (rv > 0) {