Greg Kroah-Hartman
2020-Dec-01 08:54 UTC
[Nouveau] [PATCH 5.9 129/152] drm/nouveau: fix relocations applying logic and a double-free
From: Matti Hamalainen <ccr at tnsp.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 at ffwll.ch>
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: nouveau at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Matti Hamalainen <ccr at tnsp.org>
Fixes: 03e0d26fcf79 ("drm/nouveau: slowpath for pushbuf ioctl")
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201120152338.1203257-1-ccr
at tnsp.org
Signed-off-by: Sasha Levin <sashal at kernel.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