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@xxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Matti Hamalainen <ccr@xxxxxxxx>
Fixes: 03e0d26fcf79 ("drm/nouveau: slowpath for pushbuf ioctl")
Link: https://gitlab.freedesktop.org/drm/nouveau/-/issues/11
---
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 549bc67feabb..c2051380d18c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -558,8 +558,10 @@ 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;
}
@@ -662,7 +664,6 @@ nouveau_gem_pushbuf_reloc_apply(struct nouveau_cli *cli,
nouveau_bo_wr32(nvbo, r->reloc_bo_offset >> 2, data);
}
- u_free(reloc);
return ret;
}
@@ -872,9 +873,10 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
break;
}
}
- u_free(reloc);
}
out_prevalid:
+ if (!IS_ERR(reloc))
+ u_free(reloc);
u_free(bo);
u_free(push);
base-commit: 3494d58865ad4a47611dbb427b214cc5227fa5eb
--
2.29.2
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