elf: clean up fill_note_info()

Introduce a helper function elf_note_info_init() to help fill_note_info()
to do initializations, also fix the potential memory leaks.

[akpm@linux-foundation.org: remove NUM_NOTES]
Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 442d94f..b9b3bb5 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1711,42 +1711,52 @@ struct elf_note_info {
        int numnote;
 };
 
-static int fill_note_info(struct elfhdr *elf, int phdrs,
-                         struct elf_note_info *info,
-                         long signr, struct pt_regs *regs)
+static int elf_note_info_init(struct elf_note_info *info)
 {
-#define        NUM_NOTES       6
-       struct list_head *t;
-
-       info->notes = NULL;
-       info->prstatus = NULL;
-       info->psinfo = NULL;
-       info->fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
-       info->xfpu = NULL;
-#endif
+       memset(info, 0, sizeof(*info));
        INIT_LIST_HEAD(&info->thread_list);
 
-       info->notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote),
-                             GFP_KERNEL);
+       /* Allocate space for six ELF notes */
+       info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL);
        if (!info->notes)
                return 0;
        info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
        if (!info->psinfo)
-               return 0;
+               goto notes_free;
        info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
        if (!info->prstatus)
-               return 0;
+               goto psinfo_free;
        info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
        if (!info->fpu)
-               return 0;
+               goto prstatus_free;
 #ifdef ELF_CORE_COPY_XFPREGS
        info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
        if (!info->xfpu)
-               return 0;
+               goto fpu_free;
+#endif
+       return 1;
+#ifdef ELF_CORE_COPY_XFPREGS
+ fpu_free:
+       kfree(info->fpu);
 #endif
+ prstatus_free:
+       kfree(info->prstatus);
+ psinfo_free:
+       kfree(info->psinfo);
+ notes_free:
+       kfree(info->notes);
+       return 0;
+}
+
+static int fill_note_info(struct elfhdr *elf, int phdrs,
+                         struct elf_note_info *info,
+                         long signr, struct pt_regs *regs)
+{
+       struct list_head *t;
+
+       if (!elf_note_info_init(info))
+               return 0;
 
-       info->thread_status_size = 0;
        if (signr) {
                struct core_thread *ct;
                struct elf_thread_status *ets;
@@ -1806,8 +1816,6 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 #endif
 
        return 1;
-
-#undef NUM_NOTES
 }
 
 static size_t get_note_info_size(struct elf_note_info *info)