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sd-bus: fix error handling on readv()

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let's make sure we collect the right error code from errno, otherwise
we'll see EPERM (i.e. error 1) for all errors readv() returns (since it
returns -1 on error), including EAGAIN.

This is definitely backport material.

A fix-up for 3691bcf3c5.

Fixes: #16699
This commit is contained in:
Lennart Poettering 2020-08-20 12:59:23 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 7489ccc350
commit c1093c34d7
1 changed files with 8 additions and 4 deletions
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12
src/libsystemd/sd-bus/bus-socket.c
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@ -544,9 +544,11 @@ static int bus_socket_read_auth(sd_bus *b) {
iov = IOVEC_MAKE((uint8_t *)b->rbuffer + b->rbuffer_size, n - b->rbuffer_size);
if (b->prefer_readv)
if (b->prefer_readv) {
k = readv(b->input_fd, &iov, 1);
else {
if (k < 0)
k = -errno;
} else {
mh = (struct msghdr) {
.msg_iov = &iov,
.msg_iovlen = 1,
@ -1187,9 +1189,11 @@ int bus_socket_read_message(sd_bus *bus) {
iov = IOVEC_MAKE((uint8_t *)bus->rbuffer + bus->rbuffer_size, need - bus->rbuffer_size);
if (bus->prefer_readv)
if (bus->prefer_readv) {
k = readv(bus->input_fd, &iov, 1);
else {
if (k < 0)
k = -errno;
} else {
mh = (struct msghdr) {
.msg_iov = &iov,
.msg_iovlen = 1,