From 2197f5cbabf162842747a67f1421a2febcbb3718 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 29 Nov 2012 14:18:40 +1100 Subject: [PATCH] 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. Signed-off-by: Alan Cox Signed-off-by: Andrew Morton --- fs/binfmt_elf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 6d7d1647a68c..1dc9b185e33d 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); -- 2.39.5