fs/pipe.c: local vars have to match types of proper pipe_inode_info fields

head, tail, ring_size are declared as unsigned int, so all local
variables that operate with these fields have to be unsigned to avoid
signed integer overflow.

Right now, it isn't an issue because the maximum pipe size is limited by
1U<<31.

Link: https://lkml.kernel.org/r/20220106171946.36128-1-avagin@gmail.com
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Suggested-by: Dmitry Safonov <0x7f454c46@gmail.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/pipe.c b/fs/pipe.c
index ba0841b..9648ac1 100644 (file)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -607,7 +607,7 @@ out:
 static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        struct pipe_inode_info *pipe = filp->private_data;
-       int count, head, tail, mask;
+       unsigned int count, head, tail, mask;
 
        switch (cmd) {
        case FIONREAD:
@@ -829,7 +829,7 @@ out_free_uid:
 
 void free_pipe_info(struct pipe_inode_info *pipe)
 {
-       int i;
+       unsigned int i;
 
 #ifdef CONFIG_WATCH_QUEUE
        if (pipe->watch_queue)