mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
0aa9e4f147
If efs_symlink_readpage hits the -ENAMETOOLONG error path, it will call unlock_kernel without ever having called lock_kernel(); fix this by creating and jumping to a new label fail_notlocked rather than the fail label used after calling lock_kernel(). Signed-off-by: Josh Triplett <josh@freedesktop.org> Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
|
|
* symlink.c
|
|
*
|
|
* Copyright (c) 1999 Al Smith
|
|
*
|
|
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
|
|
*/
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/efs_fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/smp_lock.h>
|
|
|
|
static int efs_symlink_readpage(struct file *file, struct page *page)
|
|
{
|
|
char *link = kmap(page);
|
|
struct buffer_head * bh;
|
|
struct inode * inode = page->mapping->host;
|
|
efs_block_t size = inode->i_size;
|
|
int err;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (size > 2 * EFS_BLOCKSIZE)
|
|
goto fail_notlocked;
|
|
|
|
lock_kernel();
|
|
/* read first 512 bytes of link target */
|
|
err = -EIO;
|
|
bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
|
|
if (!bh)
|
|
goto fail;
|
|
memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
|
|
brelse(bh);
|
|
if (size > EFS_BLOCKSIZE) {
|
|
bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
|
|
if (!bh)
|
|
goto fail;
|
|
memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
|
|
brelse(bh);
|
|
}
|
|
link[size] = '\0';
|
|
unlock_kernel();
|
|
SetPageUptodate(page);
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
return 0;
|
|
fail:
|
|
unlock_kernel();
|
|
fail_notlocked:
|
|
SetPageError(page);
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
return err;
|
|
}
|
|
|
|
const struct address_space_operations efs_symlink_aops = {
|
|
.readpage = efs_symlink_readpage
|
|
};
|