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xfs: return from xfs_symlink_verify early on V4 filesystems

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commit 7f8b718c58783f3ff0810b39e2f62f50ba2549f6 upstream.

V4 symlink blocks didn't have headers, so return early if this is a V4
filesystem.

Cc: <stable@vger.kernel.org> # v5.1
Fixes: 39708c20ab ("xfs: miscellaneous verifier magic value fixups")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong
2024-12-02 10:57:43 -08:00
committed by Greg Kroah-Hartman
parent eca6418250
commit c9a5e3a17c
1 changed files with 3 additions and 1 deletions
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4
fs/xfs/libxfs/xfs_symlink_remote.c
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@@ -89,8 +89,10 @@ xfs_symlink_verify(
struct xfs_mount *mp = bp->b_mount;
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
/* no verification of non-crc buffers */
if (!xfs_has_crc(mp))
return __this_address;
return NULL;
if (!xfs_verify_magic(bp, dsl->sl_magic))
return __this_address;
if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_meta_uuid))