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ntfs: reinit search context before volume information lookup

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On mount the volume inode is searched for $VOLUME_NAME and then, reusing
the same search context, for $VOLUME_INFORMATION. The $VOLUME_NAME lookup
is optional and its result is otherwise ignored.

Once lookup-time validation can reject a corrupt $VOLUME_NAME with -EIO,
the search context is left in an undefined state: ntfs_attr_find()
documents that on an actual error @ctx->attr is undefined. Continuing the
$VOLUME_INFORMATION search from that context is not contractually valid.

Reinitialize the search context before the $VOLUME_INFORMATION lookup so
it always starts from a well-defined state regardless of the
$VOLUME_NAME lookup outcome.

Cc: stable@vger.kernel.org # v7.1
Signed-off-by: DaeMyung Kang <charsyam@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
DaeMyung Kang 2026-05-30 23:35:11 +09:00 committed by Namjae Jeon
parent 40d88020d0
commit 45dd046ced
1 changed files with 1 additions and 0 deletions
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1
fs/ntfs/super.c
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@ -1461,6 +1461,7 @@ static bool load_system_files(struct ntfs_volume *vol)
vol->volume_label = NULL;
}
ntfs_attr_reinit_search_ctx(ctx);
if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
ctx) || ctx->attr->non_resident || ctx->attr->flags) {
ntfs_attr_put_search_ctx(ctx);