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linux/check_native: Always close socket on return

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The error paths of __check_native would leave the socket FD open on
return, resulting in an FD leak.  Rework function exit paths so that
the fd is always closed on return.
This commit is contained in:
Siddhesh Poyarekar
2021-05-12 09:14:54 +05:30
parent 5188a9d026
commit 900962f37f
1 changed files with 11 additions and 12 deletions
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23
sysdeps/unix/sysv/linux/check_native.c
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@ -48,12 +48,15 @@ __check_native (uint32_t a1_index, int *a1_native,
nladdr.nl_family = AF_NETLINK;
socklen_t addr_len = sizeof (nladdr);
bool use_malloc = false;
if (fd < 0
|| __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) != 0
|| __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) != 0)
if (fd < 0)
return;
if (__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) != 0
|| __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) != 0)
goto out;
pid_t pid = nladdr.nl_pid;
struct req
{
@ -85,7 +88,6 @@ __check_native (uint32_t a1_index, int *a1_native,
#else
const size_t buf_size = __getpagesize ();
#endif
bool use_malloc = false;
char *buf;
if (__libc_use_alloca (buf_size))
@ -96,7 +98,7 @@ __check_native (uint32_t a1_index, int *a1_native,
if (buf != NULL)
use_malloc = true;
else
goto out_fail;
goto out;
}
struct iovec iov = { buf, buf_size };
@ -104,7 +106,7 @@ __check_native (uint32_t a1_index, int *a1_native,
if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
(struct sockaddr *) &nladdr,
sizeof (nladdr))) < 0)
goto out_fail;
goto out;
bool done = false;
do
@ -123,10 +125,10 @@ __check_native (uint32_t a1_index, int *a1_native,
ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
__netlink_assert_response (fd, read_len);
if (read_len < 0)
goto out_fail;
goto out;
if (msg.msg_flags & MSG_TRUNC)
goto out_fail;
goto out;
struct nlmsghdr *nlmh;
for (nlmh = (struct nlmsghdr *) buf;
@ -166,12 +168,9 @@ __check_native (uint32_t a1_index, int *a1_native,
}
while (! done);
out:
out:
__close_nocancel_nostatus (fd);
return;
out_fail:
if (use_malloc)
free (buf);
}