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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-31 10:13:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-31 10:13:05 -0800
commit937108b093f74ed8ae4fed21ee215bcb773e2781 (patch)
tree09864b974671e5b9a73fd9f01e84eff227b2eb36
parent83f4997a01e72844045a2bf1f348359a1acbfb19 (diff)
parent8fc75bed96bb94e23ca51bd9be4daf65c57697bf (diff)
download96b-common-937108b093f74ed8ae4fed21ee215bcb773e2781.tar.gz
Merge tag 'nfs-for-5.0-3' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client fixes from Anna Schumaker: "This addresses two bugs, one in the error code handling of nfs_page_async_flush() and one to fix a potential NULL pointer dereference in nfs_parse_devname(). Stable bugfix: - Fix up return value on fatal errors in nfs_page_async_flush() Other bugfix: - Fix NULL pointer dereference of dev_name" * tag 'nfs-for-5.0-3' of git://git.linux-nfs.org/projects/anna/linux-nfs: NFS: Fix up return value on fatal errors in nfs_page_async_flush() nfs: Fix NULL pointer dereference of dev_name
-rw-r--r--fs/nfs/super.c5
-rw-r--r--fs/nfs/write.c9
2 files changed, 10 insertions, 4 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 22ce3c8a2f46..0570391eaa16 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1895,6 +1895,11 @@ static int nfs_parse_devname(const char *dev_name,
size_t len;
char *end;
+ if (unlikely(!dev_name || !*dev_name)) {
+ dfprintk(MOUNT, "NFS: device name not specified\n");
+ return -EINVAL;
+ }
+
/* Is the host name protected with square brakcets? */
if (*dev_name == '[') {
end = strchr(++dev_name, ']');
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 5a0bbf917a32..f12cb31a41e5 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -621,11 +621,12 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
nfs_set_page_writeback(page);
WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
- ret = 0;
+ ret = req->wb_context->error;
/* If there is a fatal error that covers this write, just exit */
- if (nfs_error_is_fatal_on_server(req->wb_context->error))
+ if (nfs_error_is_fatal_on_server(ret))
goto out_launder;
+ ret = 0;
if (!nfs_pageio_add_request(pgio, req)) {
ret = pgio->pg_error;
/*
@@ -635,9 +636,9 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
nfs_context_set_write_error(req->wb_context, ret);
if (nfs_error_is_fatal_on_server(ret))
goto out_launder;
- }
+ } else
+ ret = -EAGAIN;
nfs_redirty_request(req);
- ret = -EAGAIN;
} else
nfs_add_stats(page_file_mapping(page)->host,
NFSIOS_WRITEPAGES, 1);