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Subject[PATCH] cachefiles: fix __cachefiles_prepare_write() error handling
Date
From: Arnd Bergmann <arnd@arndb.de>

clang points out that __cachefiles_prepare_write() returns an
uninitialized error code in one of the code paths:

fs/cachefiles/io.c:489:6: error: variable 'ret' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
if (pos == 0)
^~~~~~~~
fs/cachefiles/io.c:492:6: note: uninitialized use occurs here
if (ret < 0) {
^~~
fs/cachefiles/io.c:489:2: note: remove the 'if' if its condition is always true
if (pos == 0)
^~~~~~~~~~~~~
fs/cachefiles/io.c:440:9: note: initialize the variable 'ret' to silence this warning
int ret;
^

Rework to return zero for success here and skip the rest of the
function.

Fixes: 0443b01eccbb ("cachefiles: Implement the I/O routines")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
fs/cachefiles/io.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 74ef4d1fc562..0fab313a604d 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -486,9 +486,11 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
/* Partially allocated, but insufficient space: cull. */
fscache_count_no_write_space();
pos = cachefiles_inject_remove_error();
- if (pos == 0)
- ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
- *_start, *_len);
+ if (pos != 0)
+ return 0;
+
+ ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+ *_start, *_len);
if (ret < 0) {
trace_cachefiles_io_error(object, file_inode(file), ret,
cachefiles_trace_fallocate_error);
--
2.29.2
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