From: Michal Srb Date: Mon, 5 Feb 2018 16:04:37 +0000 (+0000) Subject: drm/i915/cmdparser: Check reg_table_count before derefencing. X-Git-Tag: v4.9.201~17 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eaae4e6ef12d324a87f82561c570d48e5de98182;p=platform%2Fkernel%2Flinux-amlogic.git drm/i915/cmdparser: Check reg_table_count before derefencing. commit 2f265fad9756a40c09e3f4dcc62d5d7fa73a9fb2 upstream. The find_reg function was assuming that there is always at least one table in reg_tables. It is not always true. In case of VCS or VECS, the reg_tables is NULL and reg_table_count is 0, implying that no register-accessing commands are allowed. However, the command tables include commands such as MI_STORE_REGISTER_MEM. When trying to check such command, the find_reg would dereference NULL pointer. Now it will just return NULL meaning that the register was not found and the command will be rejected. Fixes: 76ff480ec963 ("drm/i915/cmdparser: Use binary search for faster register lookup") Signed-off-by: Michal Srb Link: https://patchwork.freedesktop.org/patch/msgid/20180205142916.27092-2-msrb@suse.com Cc: Chris Wilson Cc: Matthew Auld Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20180205160438.3267-1-chris@chris-wilson.co.uk register lookup") Reviewed-by: Jon Bloomfield Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index cd124df3e005..d844ab00be69 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -1038,7 +1038,7 @@ find_reg(const struct intel_engine_cs *engine, bool is_master, u32 addr) const struct drm_i915_reg_table *table = engine->reg_tables; int count = engine->reg_table_count; - do { + for (; count > 0; ++table, --count) { if (!table->master || is_master) { const struct drm_i915_reg_descriptor *reg; @@ -1046,7 +1046,7 @@ find_reg(const struct intel_engine_cs *engine, bool is_master, u32 addr) if (reg != NULL) return reg; } - } while (table++, --count); + } return NULL; }