In the case where shmem_swapin returns null, the jump to the error return
path via label 'failed' will end up with the uninitialized pointer folio
being null checked a few statements later. Fix this by ensuring folio is
initialized to null.
Detected by clang scan:
mm/shmem.c:1704:7: warning: variable 'folio' is used uninitialized
whenever 'if' condition is true [-Wsometimes-uninitialized]
Fixes: 2b58b3f33ba2 ("mm/shmem: convert shmem_swapin_page() to shmem_swapin_folio()")
Signed-off-by: Colin Ian King <colin.i.king@xxxxxxxxx>
---
mm/shmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 107f1e4dd0aa..7faaa61ff7fa 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1682,7 +1682,7 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
struct shmem_inode_info *info = SHMEM_I(inode);
struct mm_struct *charge_mm = vma ? vma->vm_mm : NULL;
struct page *page;
- struct folio *folio;
+ struct folio *folio = NULL;
swp_entry_t swap;
int error;
--
2.35.1
