glsl: free or reuse memory allocated for TF varying

When a shader program is de-serialized the gl_shader_program passed in
may actually still hold memory allocations for the transform feedback
varyings. If that is the case, free the varying names and reallocate
the new storage for the names array.

This fixes a memory leak:
Direct leak of 48 byte(s) in 6 object(s) allocated from:
 in malloc (/usr/lib64/gcc/x86_64-pc-linux-gnu/7.3.0/libasan.so+0xdb880)
 in transform_feedback_varyings ../../samba/mesa/src/mesa/main/transformfeedback.c:875
 in _mesa_TransformFeedbackVaryings ../../samba/mesa/src/mesa/main/transformfeedback.c:985
 ...
Indirect leak of 42 byte(s) in 6 object(s) allocated from:
  in __interceptor_strdup (/usr/lib64/gcc/x86_64-pc-linux-gnu/7.3.0/libasan.so+0x761c8)
  in transform_feedback_varyings ../../samba/mesa/src/mesa/main/transformfeedback.c:887
  in _mesa_TransformFeedbackVaryings ../../samba/mesa/src/mesa/main/transformfeedback.c:985

Fixes: ab2643e4b06f63c93a57624003679903442634a8
   glsl: serialize data from glTransformFeedbackVaryings

Signed-off-by: Gert Wollny <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/src/compiler/glsl/serialize.cpp b/src/compiler/glsl/serialize.cpp
index 267700e7e78..26d8ec4b75b 100644
--- a/src/compiler/glsl/serialize.cpp
+++ b/src/compiler/glsl/serialize.cpp
@@ -360,13 +360,20 @@ read_xfb(struct blob_reader *metadata, struct gl_shader_program *shProg)
    if (xfb_stage == ~0u)
       return;
 
+   if (shProg->TransformFeedback.VaryingNames)  {
+      for (unsigned i = 0; i < shProg->TransformFeedback.NumVarying; ++i)
+         free(shProg->TransformFeedback.VaryingNames[i]);
+   }
+
    /* Data set by glTransformFeedbackVaryings. */
    shProg->TransformFeedback.BufferMode = blob_read_uint32(metadata);
    blob_copy_bytes(metadata, &shProg->TransformFeedback.BufferStride,
                    sizeof(shProg->TransformFeedback.BufferStride));
    shProg->TransformFeedback.NumVarying = blob_read_uint32(metadata);
+
    shProg->TransformFeedback.VaryingNames = (char **)
-      malloc(shProg->TransformFeedback.NumVarying * sizeof(GLchar *));
+      realloc(shProg->TransformFeedback.VaryingNames,
+             shProg->TransformFeedback.NumVarying * sizeof(GLchar *));
    /* Note, malloc used with VaryingNames. */
    for (unsigned i = 0; i < shProg->TransformFeedback.NumVarying; i++)
       shProg->TransformFeedback.VaryingNames[i] =