From: Dongliang Mu <mudongliangabcd@xxxxxxxxx> [ Upstream commit 714fbf2647b1a33d914edd695d4da92029c7e7c0 ] ntfs_read_inode_mount invokes ntfs_malloc_nofs with zero allocation size. It triggers one BUG in the __ntfs_malloc function. Fix this by adding sanity check on ni->attr_list_size. Link: https://lkml.kernel.org/r/20220120094914.47736-1-dzm91@xxxxxxxxxxx Reported-by: syzbot+3c765c5248797356edaa@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Dongliang Mu <mudongliangabcd@xxxxxxxxx> Acked-by: Anton Altaparmakov <anton@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- fs/ntfs/inode.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c index 4474adb393ca..517b71c73aa9 100644 --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -1881,6 +1881,10 @@ int ntfs_read_inode_mount(struct inode *vi) } /* Now allocate memory for the attribute list. */ ni->attr_list_size = (u32)ntfs_attr_size(a); + if (!ni->attr_list_size) { + ntfs_error(sb, "Attr_list_size is zero"); + goto put_err_out; + } ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size); if (!ni->attr_list) { ntfs_error(sb, "Not enough memory to allocate buffer " -- 2.34.1
