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Subject[RFC PATCH 43/68] vfs: Make fs_parse() handle fs_param_is_fd-type params better
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Make fs_parse() handle fs_param_is_fd-type parameters that are passed a
string by converting it to an integer (in addition to handling direct fd
specification).

Also range check the integer.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/fs_parser.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index be86703ec371..bd59e1725c50 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -208,9 +208,20 @@ int fs_parse(struct fs_context *fc,
goto okay;

case fs_param_is_fd: {
- if (param->type != fs_value_is_file)
+ switch (param->type) {
+ case fs_value_is_string:
+ ret = kstrtouint(param->string, 0, &result->uint_32);
+ break;
+ case fs_value_is_file:
+ result->uint_32 = param->dirfd;
+ ret = 0;
+ default:
goto bad_value;
- goto okay;
+ }
+
+ if (result->uint_32 > INT_MAX)
+ goto bad_value;
+ goto maybe_okay;
}

case fs_param_is_blockdev:
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