Hi Thomas, url: https://github.com/0day-ci/linux/commits/Thomas-Zimmermann/ast-Fix-I2C-corner-cases-wrt-init-cleanup/20211201-233308 base: 6a8f90ec433e2f5de5fc16d7a4839771b7027cc0 config: i386-randconfig-m021-20211203 (https://download.01.org/0day-ci/archive/20211204/202112042126.N4Qr3RiC-lkp@xxxxxxxxx/config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/gpu/drm/ast/ast_mode.c:1231 ast_get_modes() error: uninitialized symbol 'edid'. drivers/gpu/drm/ast/ast_mode.c:1232 ast_get_modes() warn: passing freed memory 'edid' vim +/edid +1231 drivers/gpu/drm/ast/ast_mode.c 312fec1405dd54 Dave Airlie 2012-02-29 1209 static int ast_get_modes(struct drm_connector *connector) 312fec1405dd54 Dave Airlie 2012-02-29 1210 { 312fec1405dd54 Dave Airlie 2012-02-29 1211 struct ast_connector *ast_connector = to_ast_connector(connector); fa7dbd7688849d Thomas Zimmermann 2020-06-17 1212 struct ast_private *ast = to_ast_private(connector->dev); 312fec1405dd54 Dave Airlie 2012-02-29 1213 struct edid *edid; ^^^^^^^^^^^^^^^^^^ 312fec1405dd54 Dave Airlie 2012-02-29 1214 int ret; 83c6620bae3f14 Dave Airlie 2014-03-28 1215 bool flags = false; 6c9bd4432b2527 Gregory Williams 2021-07-30 1216 83c6620bae3f14 Dave Airlie 2014-03-28 1217 if (ast->tx_chip_type == AST_TX_DP501) { 83c6620bae3f14 Dave Airlie 2014-03-28 1218 ast->dp501_maxclk = 0xff; 83c6620bae3f14 Dave Airlie 2014-03-28 1219 edid = kmalloc(128, GFP_KERNEL); 83c6620bae3f14 Dave Airlie 2014-03-28 1220 if (!edid) 83c6620bae3f14 Dave Airlie 2014-03-28 1221 return -ENOMEM; 312fec1405dd54 Dave Airlie 2012-02-29 1222 83c6620bae3f14 Dave Airlie 2014-03-28 1223 flags = ast_dp501_read_edid(connector->dev, (u8 *)edid); 83c6620bae3f14 Dave Airlie 2014-03-28 1224 if (flags) 83c6620bae3f14 Dave Airlie 2014-03-28 1225 ast->dp501_maxclk = ast_get_dp501_max_clk(connector->dev); 83c6620bae3f14 Dave Airlie 2014-03-28 1226 else 83c6620bae3f14 Dave Airlie 2014-03-28 1227 kfree(edid); ^^^^^^^^^^^ 83c6620bae3f14 Dave Airlie 2014-03-28 1228 } 75bd8f71712a8a Thomas Zimmermann 2021-12-01 1229 if (!flags && ast_connector->i2c) If "flags" is false then "edid" is either freed or uninitialized. So if "ast_connector->i2c" also is false then that's going to cause problems. Hopefully that part of the condition can just be removed? if (!flags) edid = drm_get_edid(connector, &ast_connector->i2c->adapter); 312fec1405dd54 Dave Airlie 2012-02-29 1230 edid = drm_get_edid(connector, &ast_connector->i2c->adapter); 312fec1405dd54 Dave Airlie 2012-02-29 @1231 if (edid) { c555f02371c338 Daniel Vetter 2018-07-09 @1232 drm_connector_update_edid_property(&ast_connector->base, edid); 312fec1405dd54 Dave Airlie 2012-02-29 1233 ret = drm_add_edid_modes(connector, edid); 993dcb05e47e35 Jani Nikula 2012-08-15 1234 kfree(edid); 312fec1405dd54 Dave Airlie 2012-02-29 1235 return ret; 6c9bd4432b2527 Gregory Williams 2021-07-30 1236 } c555f02371c338 Daniel Vetter 2018-07-09 1237 drm_connector_update_edid_property(&ast_connector->base, NULL); 312fec1405dd54 Dave Airlie 2012-02-29 1238 return 0; 312fec1405dd54 Dave Airlie 2012-02-29 1239 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
