Subject: Re: [PATCH] tmpfs symlink size bug
From: Christoph Rohland <[email-masked]>
To: Herbert Xu <[email-masked]>
Cc: [email-masked], Linus Torvalds <[email-masked]>, Alan Cox <[email-masked]>
Date: 29 Oct 2001 09:49:30 +0100

Hi Herbert,

On Sun, 28 Oct 2001, Herbert Xu wrote:
> Since 2.4.12 the size of symlinks on tmpfs has been off by one.  The
> following patch corrects that error.

Thanks for spotting. I prefer the following patch.

Alan, Linus, please apply.

Greetings
		Christoph

--- 2.4.13/mm/shmem.c	Sun Oct 28 16:59:03 2001
+++ t2.4.13/mm/shmem.c	Mon Oct 29 09:45:51 2001
@@ -1151,16 +1151,16 @@
 	if (error)
 		return error;
 
-	len = strlen(symname) + 1;
-	if (len > PAGE_CACHE_SIZE)
+	len = strlen(symname);
+	if (len >= PAGE_CACHE_SIZE)
 		return -ENAMETOOLONG;
 		
 	inode = dentry->d_inode;
 	info = SHMEM_I(inode);
 	inode->i_size = len;
-	if (len <= sizeof(struct shmem_inode_info)) {
+	if (len < sizeof(struct shmem_inode_info)) {
 		/* do it inline */
-		memcpy(info, symname, len);
+		memcpy(info, symname, len + 1);
 		inode->i_op = &shmem_symlink_inline_operations;
 	} else {
 		spin_lock (&shmem_ilock);
@@ -1173,7 +1173,7 @@
 			return PTR_ERR(page);
 		}
 		kaddr = kmap(page);
-		memcpy(kaddr, symname, len);
+		memcpy(kaddr, symname, len + 1);
 		kunmap(page);
 		SetPageDirty(page);
 		UnlockPage(page);

-
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