From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Tue, 6 Jun 2023 23:29:51 +0000 (-0400)
Subject: drm/amdkfd: potential error pointer dereference in ioctl
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8be295046748432c53a2dee39c469f63c60b0ec3;p=linux.git

drm/amdkfd: potential error pointer dereference in ioctl

The "target" either comes from kfd_create_process() which returns error
pointers on error or kfd_lookup_process_by_pid() which returns NULL on
error.  So we need to check for both types of errors.

Fixes: 0ab2d7532b05 ("drm/amdkfd: prepare per-process debug enable and disable")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jonathan Kim <jonathan.kim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index cce2abe12e1b8..d655c5bc951fd 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -2920,9 +2920,9 @@ static int kfd_ioctl_set_debug_trap(struct file *filep, struct kfd_process *p, v
 		target = kfd_lookup_process_by_pid(pid);
 	}
 
-	if (!target) {
+	if (IS_ERR_OR_NULL(target)) {
 		pr_debug("Cannot find process PID %i to debug\n", args->pid);
-		r = -ESRCH;
+		r = target ? PTR_ERR(target) : -ESRCH;
 		goto out;
 	}