From: Julien Brunel <brunel@xxxxxxx> In case of error, the function gfs2_inode_lookup returns an ERR pointer, but never returns a NULL pointer. So a NULL test that necessarily comes after an IS_ERR test should be deleted, and a NULL test that may come after a call to this function should be strengthened by an IS_ERR test. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @match_bad_null_test@ expression x, E; statement S1,S2; @@ x = gfs2_inode_lookup(...) ... when != x = E * if (x != NULL) S1 else S2 // </smpl> Signed-off-by: Julien Brunel <brunel@xxxxxxx> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- fs/gfs2/inode.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff -u -p a/fs/gfs2/inode.c b/fs/gfs2/inode.c --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -1033,13 +1033,11 @@ struct inode *gfs2_createi(struct gfs2_h if (bh) brelse(bh); - if (!inode) - return ERR_PTR(-ENOMEM); return inode; fail_gunlock2: gfs2_glock_dq_uninit(ghs + 1); - if (inode) + if (inode && !IS_ERR(inode)) iput(inode); fail_gunlock: gfs2_glock_dq(ghs); -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
