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authorChristoph Hellwig <hch@lst.de>2021-03-25 09:22:09 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2021-04-16 00:13:04 -0400
commit42eb0d54c08a0331d6d295420f602237968d792b (patch)
treebd62e76216c4a1092a3d966d2a3419a78591b934 /fs/file.c
parenta38fd8748464831584a19438cbb3082b5a2dab15 (diff)
fs: split receive_fd_replace from __receive_fd
receive_fd_replace shares almost no code with the general case, so split it out. Also remove the "Bump the sock usage counts" comment from both copies, as that is now what __receive_sock actually does. [AV: ... and make the only user of receive_fd_replace() choose between it and receive_fd() according to what userland had passed to it in flags] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/file.c')
-rw-r--r--fs/file.c39
1 files changed, 19 insertions, 20 deletions
diff --git a/fs/file.c b/fs/file.c
index f3a4bac2cbe9..d8ccb95a7f41 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -1068,8 +1068,6 @@ out_unlock:
/**
* __receive_fd() - Install received file into file descriptor table
- *
- * @fd: fd to install into (if negative, a new fd will be allocated)
* @file: struct file that was received from another process
* @ufd: __user pointer to write new fd number to
* @o_flags: the O_* flags to apply to the new fd entry
@@ -1083,7 +1081,7 @@ out_unlock:
*
* Returns newly install fd or -ve on error.
*/
-int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flags)
+int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags)
{
int new_fd;
int error;
@@ -1092,32 +1090,33 @@ int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flag
if (error)
return error;
- if (fd < 0) {
- new_fd = get_unused_fd_flags(o_flags);
- if (new_fd < 0)
- return new_fd;
- } else {
- new_fd = fd;
- }
+ new_fd = get_unused_fd_flags(o_flags);
+ if (new_fd < 0)
+ return new_fd;
if (ufd) {
error = put_user(new_fd, ufd);
if (error) {
- if (fd < 0)
- put_unused_fd(new_fd);
+ put_unused_fd(new_fd);
return error;
}
}
- if (fd < 0) {
- fd_install(new_fd, get_file(file));
- } else {
- error = replace_fd(new_fd, file, o_flags);
- if (error)
- return error;
- }
+ fd_install(new_fd, get_file(file));
+ __receive_sock(file);
+ return new_fd;
+}
- /* Bump the sock usage counts, if any. */
+int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags)
+{
+ int error;
+
+ error = security_file_receive(file);
+ if (error)
+ return error;
+ error = replace_fd(new_fd, file, o_flags);
+ if (error)
+ return error;
__receive_sock(file);
return new_fd;
}