From: Colin Ian King Date: Mon, 16 Aug 2021 16:30:25 +0000 (+0100) Subject: fs/ntfs3: Fix integer overflow in multiplication X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=71eeb6ace80be7389d942b9647765417e5b039f7;p=uclinux-h8%2Flinux.git fs/ntfs3: Fix integer overflow in multiplication The multiplication of the u32 data_size with a int is being performed using 32 bit arithmetic however the results is being assigned to the variable nbits that is a size_t (64 bit) value. Fix a potential integer overflow by casting the u32 value to a size_t before the multiply to use a size_t sized bit multiply operation. Addresses-Coverity: ("Unintentional integer overflow") Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block") Signed-off-by: Colin Ian King Signed-off-by: Konstantin Komarov --- diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c index 6aa9540ece47..9386c551e208 100644 --- a/fs/ntfs3/index.c +++ b/fs/ntfs3/index.c @@ -2012,7 +2012,7 @@ static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni, unsigned long pos; const unsigned long *bm = resident_data(b); - nbits = le32_to_cpu(b->res.data_size) * 8; + nbits = (size_t)le32_to_cpu(b->res.data_size) * 8; if (bit >= nbits) return 0;