From: David Sterba <dsterba@xxxxxxxx>
[ Upstream commit 33e17b3f5ab74af12aca58c515bc8424ff69a343 ]
The arg->clone_sources_count is u64 and can trigger a warning when a
huge value is passed from user space and a huge array is allocated.
Limit the allocated memory to 8MiB (can be increased if needed), which
in turn limits the number of clone sources to 8M / sizeof(struct
clone_root) = 8M / 40 = 209715. Real world number of clones is from
tens to hundreds, so this is future proof.
Reported-by: syzbot+4376a9a073770c173269@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/btrfs/send.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index efab9446eac87..b08e7fcd8c34d 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6646,10 +6646,10 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
/*
* Check that we don't overflow at later allocations, we request
* clone_sources_count + 1 items, and compare to unsigned long inside
- * access_ok.
+ * access_ok. Also set an upper limit for allocation size so this can't
+ * easily exhaust memory. Max number of clone sources is about 200K.
*/
- if (arg->clone_sources_count >
- ULONG_MAX / sizeof(struct clone_root) - 1) {
+ if (arg->clone_sources_count > SZ_8M / sizeof(struct clone_root)) {
ret = -EINVAL;
goto out;
}
--
2.39.0
