tjh.dev / kernel
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ext4: validate ea_ino and size in check_xattrs

During xattr block validation, check_xattrs() processes xattr entries
without validating that entries claiming to use EA inodes have non-zero
sizes. Corrupted filesystems may contain xattr entries where e_value_size
is zero but e_value_inum is non-zero, indicating invalid xattr data.

Add validation in check_xattrs() to detect this corruption pattern early
and return -EFSCORRUPTED, preventing invalid xattr entries from causing
issues throughout the ext4 codebase.

Cc: stable@kernel.org
Suggested-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: syzbot+4c9d23743a2409b80293@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=4c9d23743a2409b80293
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Message-ID: <20250923133245.1091761-1-kartikey406@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

authored by

Deepanshu Kartikey and committed by
Theodore Ts'o 44d2a72f 57295e83

+4
+4
fs/ext4/xattr.c
··· 251 251 err_str = "invalid ea_ino"; 252 252 goto errout; 253 253 } 254 + if (ea_ino && !size) { 255 + err_str = "invalid size in ea xattr"; 256 + goto errout; 257 + } 254 258 if (size > EXT4_XATTR_SIZE_MAX) { 255 259 err_str = "e_value size too large"; 256 260 goto errout;