From 7c55b78818cfb732680c4a72ab270cc2d2ee3d0f Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 14 May 2024 12:06:34 +0200
Subject: [PATCH] jfs: xattr: fix buffer overflow for invalid xattr
When an xattr size is not what is expected, it is printed out to the
kernel log in hex format as a form of debugging. But when that xattr
size is bigger than the expected size, printing it out can cause an
access off the end of the buffer.
Fix this all up by properly restricting the size of the debug hex dump
in the kernel log.
Reported-by: syzbot+9dfe490c8176301c1d06@syzkaller.appspotmail.com
Cc: Dave Kleikamp <shaggy@kernel.org>
Link: https://lore.kernel.org/r/2024051433-slider-cloning-98f9@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/jfs/xattr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index 0fb7afac298e1..9987055293b35 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -557,9 +557,11 @@ static int ea_get(struct inode *inode, struct ea_buffer *ea_buf, int min_size)
size_check:
if (EALIST_SIZE(ea_buf->xattr) != ea_size) {
+ int size = min_t(int, EALIST_SIZE(ea_buf->xattr), ea_size);
+
printk(KERN_ERR "ea_get: invalid extended attribute\n");
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_ADDRESS, 16, 1,
- ea_buf->xattr, ea_size, 1);
+ ea_buf->xattr, size, 1);
ea_release(inode, ea_buf);
rc = -EIO;
goto clean_up;
--
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