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authorNeilBrown <neilb@suse.de>2023-03-08 09:51:00 +0300
committerChuck Lever <chuck.lever@oracle.com>2023-04-26 16:05:00 +0300
commitcf64b9bce95095b80f4589e4f54572cc5d8c1538 (patch)
treec431f8564e166026b82255b0c66fca2319020b91 /fs/nfsd/export.c
parent2f90e18ffec47c265c14e313047189b79784bc0e (diff)
downloadlinux-cf64b9bce95095b80f4589e4f54572cc5d8c1538.tar.xz
SUNRPC: return proper error from get_expiry()
The get_expiry() function currently returns a timestamp, and uses the special return value of 0 to indicate an error. Unfortunately this causes a problem when 0 is the correct return value. On a system with no RTC it is possible that the boot time will be seen to be "3". When exportfs probes to see if a particular filesystem supports NFS export it tries to cache information with an expiry time of "3". The intention is for this to be "long in the past". Even with no RTC it will not be far in the future (at most a second or two) so this is harmless. But if the boot time happens to have been calculated to be "3", then get_expiry will fail incorrectly as it converts the number to "seconds since bootime" - 0. To avoid this problem we change get_expiry() to report the error quite separately from the expiry time. The error is now the return value. The expiry time is reported through a by-reference parameter. Reported-by: Jerry Zhang <jerry@skydio.com> Tested-by: Jerry Zhang <jerry@skydio.com> Signed-off-by: NeilBrown <neilb@suse.de> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/export.c')
-rw-r--r--fs/nfsd/export.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 668c7527b17e..6da74aebe1fb 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -123,11 +123,11 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
/* OK, we seem to have a valid key */
key.h.flags = 0;
- key.h.expiry_time = get_expiry(&mesg);
- if (key.h.expiry_time == 0)
+ err = get_expiry(&mesg, &key.h.expiry_time);
+ if (err)
goto out;
- key.ek_client = dom;
+ key.ek_client = dom;
key.ek_fsidtype = fsidtype;
memcpy(key.ek_fsid, buf, len);
@@ -610,9 +610,8 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
exp.ex_devid_map = NULL;
/* expiry */
- err = -EINVAL;
- exp.h.expiry_time = get_expiry(&mesg);
- if (exp.h.expiry_time == 0)
+ err = get_expiry(&mesg, &exp.h.expiry_time);
+ if (err)
goto out3;
/* flags */
@@ -624,7 +623,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
if (err || an_int < 0)
goto out3;
exp.ex_flags= an_int;
-
+
/* anon uid */
err = get_int(&mesg, &an_int);
if (err)