Context: _mesa_add_parameter is sometimes[0] called with a
NULL name as a mean of an unnamed parameter.
Allowing NULL pointer as a name means that it must be NULL checked
each access. So far it isn't always[1] true.
Parameter name is only used for debug purpose (printf) and
to lookup the index/location of the program by the application.
Conclusion, there is no valid reason to use a NULL pointer instead of
an empty string. So it was decided to use an empty string which avoid all
issues related to NULL pointer
[0]: texture gather offsets glsl opcode and st_init_atifs_prog
[1]: at least shader cache, st_nir_lookup_parameter_index and some printfs
Issue found by piglit 'texturegatheroffsets' tests on Nouveau
v4: new patch based on Nicolai/Timothy/ilia discussion
Signed-off-by: Gregory Hainaut <gregory.hain...@gmail.com>
---
src/mesa/program/prog_parameter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/mesa/program/prog_parameter.c
b/src/mesa/program/prog_parameter.c
index c294b00..6689c71 100644
--- a/src/mesa/program/prog_parameter.c
+++ b/src/mesa/program/prog_parameter.c
@@ -258,7 +258,7 @@ _mesa_add_parameter(struct gl_program_parameter_list
*paramList,
for (i = 0; i < sz4; i++) {
struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
- p->Name = name ? strdup(name) : NULL;
+ p->Name = strdup(name ? name : "");
p->Type = type;
p->Size = size;
p->DataType = datatype;
--
2.1.4
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
