ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()

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Unlike other strings in the ext4 superblock, we rely on tune2fs to
make sure s_mount_opts is NUL terminated.  Harden
parse_apply_sb_mount_options() by treating s_mount_opts as a potential
__nonstring.

Cc: stable@vger.kernel.org
Fixes: 8b67f04ab9 ("ext4: Add mount options in superblock")
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Message-ID: <20250916-tune2fs-v2-1-d594dc7486f0@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

...

This commit is contained in:

Theodore Ts'o 2025-09-16 23:22:47 -04:00

parent 12e803c882

commit 8ecb790ea8

1 changed files with 5 additions and 12 deletions

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fs/ext4/super.c

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