Patch "nilfs2: fix OOB in nilfs_set_de_type" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    nilfs2: fix OOB in nilfs_set_de_type

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nilfs2-fix-oob-in-nilfs_set_de_type.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From c4a7dc9523b59b3e73fd522c73e95e072f876b16 Mon Sep 17 00:00:00 2001
From: Jeongjun Park <aha310510@xxxxxxxxx>
Date: Tue, 16 Apr 2024 03:20:48 +0900
Subject: nilfs2: fix OOB in nilfs_set_de_type

From: Jeongjun Park <aha310510@xxxxxxxxx>

commit c4a7dc9523b59b3e73fd522c73e95e072f876b16 upstream.

The size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is
defined as "S_IFMT >> S_SHIFT", but the nilfs_set_de_type() function,
which uses this array, specifies the index to read from the array in the
same way as "(mode & S_IFMT) >> S_SHIFT".

static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode
 *inode)
{
	umode_t mode = inode->i_mode;

	de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; // oob
}

However, when the index is determined this way, an out-of-bounds (OOB)
error occurs by referring to an index that is 1 larger than the array size
when the condition "mode & S_IFMT == S_IFMT" is satisfied.  Therefore, a
patch to resize the nilfs_type_by_mode array should be applied to prevent
OOB errors.

Link: https://lkml.kernel.org/r/20240415182048.7144-1-konishi.ryusuke@xxxxxxxxx
Reported-by: syzbot+2e22057de05b9f3b30d8@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=2e22057de05b9f3b30d8
Fixes: 2ba466d74ed7 ("nilfs2: directory entry operations")
Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nilfs2/dir.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -240,7 +240,7 @@ nilfs_filetype_table[NILFS_FT_MAX] = {
 
 #define S_SHIFT 12
 static unsigned char
-nilfs_type_by_mode[S_IFMT >> S_SHIFT] = {
+nilfs_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
 	[S_IFREG >> S_SHIFT]	= NILFS_FT_REG_FILE,
 	[S_IFDIR >> S_SHIFT]	= NILFS_FT_DIR,
 	[S_IFCHR >> S_SHIFT]	= NILFS_FT_CHRDEV,


Patches currently in stable-queue which might be from aha310510@xxxxxxxxx are

queue-6.8/nilfs2-fix-oob-in-nilfs_set_de_type.patch




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