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commit eb4b691b9115fae4c844f5941418335575cf667f upstream.
FUSE attempts to detect server support for statx by trying it once and
setting no_statx=1 if it fails with ENOSYS, but consider the following
scenario:
- Userspace (e.g. sh) calls stat() on a file
* succeeds
- Userspace (e.g. lsd) calls statx(BTIME) on the same file
- request_mask = STATX_BASIC_STATS | STATX_BTIME
- first pass: sync=true due to differing cache_mask
- statx fails and returns ENOSYS
- set no_statx and retry
- retry sets mask = STATX_BASIC_STATS
- now mask == cache_mask; sync=false (time_before: still valid)
- so we take the "else if (stat)" path
- "err" is still ENOSYS from the failed statx call
Fix this by zeroing "err" before retrying the failed call.
Fixes: d3045530bdd2 ("fuse: implement statx")
Cc: stable@vger.kernel.org # v6.6
Signed-off-by: Danny Lin <danny@orbstack.dev>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
885d4c31a4