2 files changed, 7 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index e18d8bf67d60..07e3c2dee900 100644
--- a/UPDATING
+++ b/UPDATING
@@ -19,6 +19,8 @@ build and install as described in the COMMON ITEMS section.
 	in some cases allow a normal user to unmount a file system
 	when usermounts have been changed from enabled to disabled.
 
+	Fix a panic in pseudofs(9).
+
 20040205:	p2	FreeBSD-SA-04:02.shmat
 	Correct a reference counting bug in shmat(2).
 
diff --git a/sys/fs/pseudofs/pseudofs_vnops.c b/sys/fs/pseudofs/pseudofs_vnops.c
index 28b1a6551ad0..d21145b416e3 100644
--- a/sys/fs/pseudofs/pseudofs_vnops.c
+++ b/sys/fs/pseudofs/pseudofs_vnops.c
@@ -525,6 +525,11 @@ pfs_read(struct vop_read_args *va)
 			PRELE(proc);
 		PFS_RETURN (EINVAL);
 	}
+	if (buflen > MAXPHYS) {
+		if (proc != NULL)
+			PRELE(proc);
+		PFS_RETURN (EIO);
+	}
 	sb = sbuf_new(sb, NULL, buflen, 0);
 	if (sb == NULL) {
 		if (proc != NULL)