In case of a memory allocation failure in the volumes loop we can only process the already allocated scan_eba and fm_eba array elements on the error path - others are still uninitialized.
Found by Linux Verification Center (linuxtesting.org).
Fixes: 00abf3041590 ("UBI: Add self_check_eba()") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin pchelkin@ispras.ru --- drivers/mtd/ubi/eba.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c index 8d1f0e05892c..6f5eadb1598d 100644 --- a/drivers/mtd/ubi/eba.c +++ b/drivers/mtd/ubi/eba.c @@ -1557,6 +1557,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, GFP_KERNEL); if (!fm_eba[i]) { ret = -ENOMEM; + kfree(scan_eba[i]); goto out_free; }
@@ -1592,7 +1593,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, }
out_free: - for (i = 0; i < num_volumes; i++) { + while (--i >= 0) { if (!ubi->volumes[i]) continue;