git: a17aa2314d50 - stable/13 - libpfctl: fix pfctl_do_ioctl()

The branch stable/13 has been updated by kp:

URL: https://cgit.FreeBSD.org/src/commit/?id=a17aa2314d5078060417cbfba30b20088359ec21

commit a17aa2314d5078060417cbfba30b20088359ec21
Author:     Kristof Provost <kp@FreeBSD.org>
AuthorDate: 2023-10-23 11:43:52 +0000
Commit:     Kristof Provost <kp@FreeBSD.org>
CommitDate: 2023-10-31 08:08:46 +0000

    libpfctl: fix pfctl_do_ioctl()
    
    pfctl_do_ioctl() copies the packed request data into the request buffer
    and then frees it. However, it's possible for the buffer to be too small
    for the reply, causing us to allocate a new buffer. We then copied from
    the freed request, and freed it again.
    
    Do not free the request buffer until we're all the way done.
    
    PR:             274614
    Reviewed by:    emaste
    MFC after:      1 week
    Sponsored by:   Rubicon Communications, LLC ("Netgate")
    Differential Revision:  https://reviews.freebsd.org/D42329
    
    (cherry picked from commit 2cffb52514b070e716e700c7f58fdb8cd9b05335)
---
 lib/libpfctl/libpfctl.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/libpfctl/libpfctl.c b/lib/libpfctl/libpfctl.c
index 54e8fedbe4df..c9a5190d790c 100644
--- a/lib/libpfctl/libpfctl.c
+++ b/lib/libpfctl/libpfctl.c
@@ -72,7 +72,6 @@ pfctl_do_ioctl(int dev, uint cmd, size_t size, nvlist_t **nvl)
 retry:
 	nv.data = malloc(size);
 	memcpy(nv.data, data, nvlen);
-	free(data);
 
 	nv.len = nvlen;
 	nv.size = size;
@@ -90,13 +89,15 @@ retry:
 	if (ret == 0) {
 		*nvl = nvlist_unpack(nv.data, nv.len, 0);
 		if (*nvl == NULL) {
-			free(nv.data);
-			return (EIO);
+			ret = EIO;
+			goto out;
 		}
 	} else {
 		ret = errno;
 	}
 
+out:
+	free(data);
 	free(nv.data);
 
 	return (ret);