Milton Earl Carbe, federal prisoner # 66325-079, appeals the dismissal for lack of jurisdiction of his 28 U.S.C. § 2241 petition, in which he challenged his convictions for conspiracy to possess with intent to distribute cocaine and possession with in *652 tent to distribute cocaine. In his petition, he argues that he is confined illegally because the speedy-trial waiver he executed prior to trial was invalidated by Zedner v. United States, 547 U.S. 489, 126 S.Ct. 1976, 164 L.Ed.2d 749 (2006).

The proper vehicle for attacking errors that occurred during or before sentencing is a 28 U.S.C. § 2255 motion. See Tolliver v. Dobre, 211 F.3d 876, 877-78 (5th Cir. 2000). Under the savings clause of § 2255, however, if a prisoner can demonstrate that the § 2255 remedy would be “inadequate or ineffective to test the legality of his detention,” he may be permitted to bring a habeas corpus claim pursuant to § 2241. Reyes-Requena v. United States, 243 F.3d 893, 901 (5th Cir. 2001) (emphasis removed). The savings clause applies to a claim that is based upon a retroactively applicable Supreme Court decision which establishes that the petitioner may have been convicted of a nonexistent offense and that was foreclosed by circuit law at the time when the claim should have been raised in the petitioner’s trial, appeal, or first § 2255 motion. Id. at 904.

Carbe fails to show that Zedner, which was decided in the context of a direct appeal, applies retroactively or that it rendered any offense of conviction “nonexistent.” Thus, he has failed to demonstrate that the § 2255 remedies were ineffective and inadequate. The judgment of the district court is affirmed. Carbe’s motions for appointment of counsel, for bail pending appeal, and to supplement the record are denied.

AFFIRMED; MOTIONS DENIED.