drm/i915/dp: Fix memory leak in parse_lfp_panel_dtd()

The function parse_lfp_panel_dtd() is called when the driver
attempts to initialize the eDP connector, and it allocates memory,
which is recorded in panel->vbt.lfp_vbt_mode. However, since no
eDP panel is connected, the driver fails at intel_edp_init_dpcd()
and follows the failure path. Unfortunately, the allocated memory
is not freed in this case.

To fix this issue, free the memory in the failure path.

leak info from kmemleak:
"
unreferenced object 0xffff8881252f8800 (size 128):
  comm "systemd-udevd", pid 192, jiffies 4294896880
  hex dump (first 32 bytes):
    e8 fd 00 00 00 04 18 04 a0 04 40 05 00 00 00 03  ..........@.....
    03 03 09 03 26 03 00 00 0a 00 00 00 00 00 00 00  ....&...........
  backtrace (crc 7448f6b4):
    [<ffffffff82475c9b>] kmemleak_alloc+0x4b/0x80
    [<ffffffff814bb50e>] __kmalloc_cache_noprof+0x2be/0x390
    [<ffffffffa069862c>] intel_bios_init_panel+0x1c4c/0x2720 [xe]
    [<ffffffffa0699123>] intel_bios_init_panel_early+0x13/0x20 [xe]
    [<ffffffffa06fceb9>] intel_dp_init_connector+0x2f9/0x1080 [xe]
    [<ffffffffa06c370a>] intel_ddi_init+0xbba/0xf50 [xe]
    [<ffffffffa069b906>] intel_bios_for_each_encoder+0x36/0x60 [xe]
    [<ffffffffa06d7bd6>] intel_setup_outputs+0x206/0x450 [xe]
    [<ffffffffa06dad33>] intel_display_driver_probe_nogem+0x163/0x1f0 [xe]
    [<ffffffffa0680fc7>] xe_display_init_noaccel+0x27/0x70 [xe]
    [<ffffffffa05b30d6>] xe_device_probe+0x806/0x9a0 [xe]
    [<ffffffffa0612f0f>] xe_pci_probe+0x31f/0x590 [xe]
    [<ffffffff81b41718>] local_pci_probe+0x48/0xb0
    [<ffffffff81b432c8>] pci_device_probe+0xc8/0x280
    [<ffffffff81d5dde8>] really_probe+0xf8/0x390
    [<ffffffff81d5e11a>] __driver_probe_device+0x8a/0x170
"

v2 (Jani):
  -use intel_bios_fini_panel() to pair with intel_bios_init_panel_early()

Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016150154.1466131-1-shuicheng.lin@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 6b27fabd61c37c51044631939bb5731a6be94dc8..7e04913bc2ffb7b91351fc32dc59371b8e1446e7 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -6375,6 +6375,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 
 out_vdd_off:
        intel_pps_vdd_off_sync(intel_dp);
+       intel_bios_fini_panel(&intel_connector->panel);
 
        return false;
 }