svn commit: r295489 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Wed Feb 10 21:35:00 2016
New Revision: 295489
URL: https://svnweb.freebsd.org/changeset/base/295489

Log:
  Remove useless checks for NULL before calling free(9), in the kernel
  elf linkers.
  
  Found by:	Related PVS-Studio diagnostic
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/kern/link_elf.c
  head/sys/kern/link_elf_obj.c

Modified: head/sys/kern/link_elf.c
==============================================================================
--- head/sys/kern/link_elf.c	Wed Feb 10 21:16:37 2016	(r295488)
+++ head/sys/kern/link_elf.c	Wed Feb 10 21:35:00 2016	(r295489)
@@ -1090,12 +1090,9 @@ out:
 	vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
 	if (error != 0 && lf != NULL)
 		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
-	if (shdr != NULL)
-		free(shdr, M_LINKER);
-	if (firstpage != NULL)
-		free(firstpage, M_LINKER);
-	if (shstrs != NULL)
-		free(shstrs, M_LINKER);
+	free(shdr, M_LINKER);
+	free(firstpage, M_LINKER);
+	free(shstrs, M_LINKER);
 
 	return (error);
 }
@@ -1157,19 +1154,13 @@ link_elf_unload_file(linker_file_t file)
 		    + (ef->object->size << PAGE_SHIFT));
 	}
 #else
-	if (ef->address != NULL)
-		free(ef->address, M_LINKER);
+	free(ef->address, M_LINKER);
 #endif
-	if (ef->symbase != NULL)
-		free(ef->symbase, M_LINKER);
-	if (ef->strbase != NULL)
-		free(ef->strbase, M_LINKER);
-	if (ef->ctftab != NULL)
-		free(ef->ctftab, M_LINKER);
-	if (ef->ctfoff != NULL)
-		free(ef->ctfoff, M_LINKER);
-	if (ef->typoff != NULL)
-		free(ef->typoff, M_LINKER);
+	free(ef->symbase, M_LINKER);
+	free(ef->strbase, M_LINKER);
+	free(ef->ctftab, M_LINKER);
+	free(ef->ctfoff, M_LINKER);
+	free(ef->typoff, M_LINKER);
 }
 
 static void

Modified: head/sys/kern/link_elf_obj.c
==============================================================================
--- head/sys/kern/link_elf_obj.c	Wed Feb 10 21:16:37 2016	(r295488)
+++ head/sys/kern/link_elf_obj.c	Wed Feb 10 21:35:00 2016	(r295489)
@@ -898,8 +898,7 @@ out:
 	vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
 	if (error && lf)
 		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
-	if (hdr)
-		free(hdr, M_LINKER);
+	free(hdr, M_LINKER);
 
 	return error;
 }
@@ -930,18 +929,12 @@ link_elf_unload_file(linker_file_t file)
 		}
 	}
 	if (ef->preloaded) {
-		if (ef->reltab)
-			free(ef->reltab, M_LINKER);
-		if (ef->relatab)
-			free(ef->relatab, M_LINKER);
-		if (ef->progtab)
-			free(ef->progtab, M_LINKER);
-		if (ef->ctftab)
-			free(ef->ctftab, M_LINKER);
-		if (ef->ctfoff)
-			free(ef->ctfoff, M_LINKER);
-		if (ef->typoff)
-			free(ef->typoff, M_LINKER);
+		free(ef->reltab, M_LINKER);
+		free(ef->relatab, M_LINKER);
+		free(ef->progtab, M_LINKER);
+		free(ef->ctftab, M_LINKER);
+		free(ef->ctfoff, M_LINKER);
+		free(ef->typoff, M_LINKER);
 		if (file->filename != NULL)
 			preload_delete_name(file->filename);
 		/* XXX reclaim module memory? */
@@ -949,37 +942,25 @@ link_elf_unload_file(linker_file_t file)
 	}
 
 	for (i = 0; i < ef->nreltab; i++)
-		if (ef->reltab[i].rel)
-			free(ef->reltab[i].rel, M_LINKER);
+		free(ef->reltab[i].rel, M_LINKER);
 	for (i = 0; i < ef->nrelatab; i++)
-		if (ef->relatab[i].rela)
-			free(ef->relatab[i].rela, M_LINKER);
-	if (ef->reltab)
-		free(ef->reltab, M_LINKER);
-	if (ef->relatab)
-		free(ef->relatab, M_LINKER);
-	if (ef->progtab)
-		free(ef->progtab, M_LINKER);
+		free(ef->relatab[i].rela, M_LINKER);
+	free(ef->reltab, M_LINKER);
+	free(ef->relatab, M_LINKER);
+	free(ef->progtab, M_LINKER);
 
 	if (ef->object) {
 		vm_map_remove(kernel_map, (vm_offset_t) ef->address,
 		    (vm_offset_t) ef->address +
 		    (ef->object->size << PAGE_SHIFT));
 	}
-	if (ef->e_shdr)
-		free(ef->e_shdr, M_LINKER);
-	if (ef->ddbsymtab)
-		free(ef->ddbsymtab, M_LINKER);
-	if (ef->ddbstrtab)
-		free(ef->ddbstrtab, M_LINKER);
-	if (ef->shstrtab)
-		free(ef->shstrtab, M_LINKER);
-	if (ef->ctftab)
-		free(ef->ctftab, M_LINKER);
-	if (ef->ctfoff)
-		free(ef->ctfoff, M_LINKER);
-	if (ef->typoff)
-		free(ef->typoff, M_LINKER);
+	free(ef->e_shdr, M_LINKER);
+	free(ef->ddbsymtab, M_LINKER);
+	free(ef->ddbstrtab, M_LINKER);
+	free(ef->shstrtab, M_LINKER);
+	free(ef->ctftab, M_LINKER);
+	free(ef->ctfoff, M_LINKER);
+	free(ef->typoff, M_LINKER);
 }
 
 static const char *