lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 1 Dec 2020 09:54:04 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>, Ben Skeggs <bskeggs@...hat.com>, nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, Matti Hamalainen <ccr@...p.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.9 129/152] drm/nouveau: fix relocations applying logic and a double-free From: Matti Hamalainen <ccr@...p.org> [ Upstream commit 2be65641642ef423f82162c3a5f28c754d1637d2 ] Commit 03e0d26fcf79 ("drm/nouveau: slowpath for pushbuf ioctl") included a logic-bug which results in the relocations not actually getting applied at all as the call to nouveau_gem_pushbuf_reloc_apply() is never reached. This causes a regression with graphical corruption, triggered when relocations need to be done (for example after a suspend/resume cycle.) Fix by setting *apply_relocs value only if there were more than 0 relocations. Additionally, the never reached code had a leftover u_free() call, which, after fixing the logic, now got called and resulted in a double-free. Fix by removing one u_free(), moving the other and adding check for errors. Cc: Daniel Vetter <daniel.vetter@...ll.ch> Cc: Ben Skeggs <bskeggs@...hat.com> Cc: nouveau@...ts.freedesktop.org Cc: dri-devel@...ts.freedesktop.org Signed-off-by: Matti Hamalainen <ccr@...p.org> Fixes: 03e0d26fcf79 ("drm/nouveau: slowpath for pushbuf ioctl") Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20201120152338.1203257-1-ccr@tnsp.org Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpu/drm/nouveau/nouveau_gem.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c index 124d3dcc5c590..98e99aa8a547e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.c +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c @@ -570,8 +570,10 @@ nouveau_gem_pushbuf_validate(struct nouveau_channel *chan, NV_PRINTK(err, cli, "validating bo list\n"); validate_fini(op, chan, NULL, NULL); return ret; + } else if (ret > 0) { + *apply_relocs = true; } - *apply_relocs = ret; + return 0; } @@ -674,7 +676,6 @@ nouveau_gem_pushbuf_reloc_apply(struct nouveau_cli *cli, nouveau_bo_wr32(nvbo, r->reloc_bo_offset >> 2, data); } - u_free(reloc); return ret; } @@ -884,9 +885,10 @@ out: break; } } - u_free(reloc); } out_prevalid: + if (!IS_ERR(reloc)) + u_free(reloc); u_free(bo); u_free(push); -- 2.27.0
Powered by blists - more mailing lists