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s390/kdump: Fix memleak in nt_vmcoreinfo

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[ Upstream commit 2d2e7075b8 ]

The vmcoreinfo of a crashed system is potentially fragmented. Thus the
crash kernel has an intermediate step where the vmcoreinfo is copied into a
temporary, continuous buffer in the crash kernel memory. This temporary
buffer is never freed. Free it now to prevent the memleak.

While at it replace all occurrences of "VMCOREINFO" by its corresponding
macro to prevent potential renaming issues.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Philipp Rudo 2018-08-13 11:16:57 +02:00 committed by Greg Kroah-Hartman
parent 2b81b00edb
commit a2805f40c7
1 changed files with 12 additions and 5 deletions
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17
arch/s390/kernel/crash_dump.c
View file

@ -404,11 +404,13 @@ static void *get_vmcoreinfo_old(unsigned long *size)
if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
sizeof(nt_name) - 1))
return NULL;
if (strcmp(nt_name, "VMCOREINFO") != 0)
if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0)
return NULL;
vmcoreinfo = kzalloc_panic(note.n_descsz);
if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz))
if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) {
kfree(vmcoreinfo);
return NULL;
}
*size = note.n_descsz;
return vmcoreinfo;
}
@ -418,15 +420,20 @@ static void *get_vmcoreinfo_old(unsigned long *size)
*/
static void *nt_vmcoreinfo(void *ptr)
{
const char *name = VMCOREINFO_NOTE_NAME;
unsigned long size;
void *vmcoreinfo;
vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
if (!vmcoreinfo)
vmcoreinfo = get_vmcoreinfo_old(&size);
if (vmcoreinfo)
return nt_init_name(ptr, 0, vmcoreinfo, size, name);
vmcoreinfo = get_vmcoreinfo_old(&size);
if (!vmcoreinfo)
return ptr;
return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
ptr = nt_init_name(ptr, 0, vmcoreinfo, size, name);
kfree(vmcoreinfo);
return ptr;
}
/*