binfmt_elf: fix corner case kfree of uninitialized data

If elf_core_dump() is called and fill_note_info() fails in the kmalloc()
then it returns 0 but has not yet initialised all the needed fields.  As a
result we do a kfree(randomness) after correctly skipping the thread data.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 6d7d1647a68c..0c42cdbabecf 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1601,8 +1601,10 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
         info->thread = NULL;
 
         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
-        if (psinfo == NULL)
+        if (psinfo == NULL) {
+                info->psinfo.data = NULL; /* So we don't free this wrongly */
                 return 0;
+        }
 
         fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);