path: root/fs
diff options
authorDenys Vlasenko <vda.linux@googlemail.com>2012-09-26 11:34:50 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-26 22:20:21 -0400
commitf34f9d186df35e5c39163444c43b4fc6255e39c5 (patch)
tree4e66ee662fb2bd0c50c8b3aed27e9ce5c508059a /fs
parentusb/gadget: fix misannotations (diff)
coredump: prevent double-free on an error path in core dumper
In !CORE_DUMP_USE_REGSET case, if elf_note_info_init fails to allocate memory for info->fields, it frees already allocated stuff and returns error to its caller, fill_note_info. Which in turn returns error to its caller, elf_core_dump. Which jumps to cleanup label and calls free_note_info, which will happily try to free all info->fields again. BOOM. This is the fix. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Cc: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs')
1 files changed, 4 insertions, 15 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 1b52956afe33..0225fddf49b7 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1696,30 +1696,19 @@ static int elf_note_info_init(struct elf_note_info *info)
return 0;
info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
if (!info->psinfo)
- goto notes_free;
+ return 0;
info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
if (!info->prstatus)
- goto psinfo_free;
+ return 0;
info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
if (!info->fpu)
- goto prstatus_free;
+ return 0;
info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
if (!info->xfpu)
- goto fpu_free;
+ return 0;
return 1;
- fpu_free:
- kfree(info->fpu);
- 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,