Messages in this thread | | | Date | Mon, 2 Jan 2023 12:37:57 +0100 | Subject | Re: [PATCH] x86/kexec: Fix double-free of elf header buffer | From | Vlastimil Babka <> |
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On 11/22/22 12:51, Takashi Iwai wrote: > The recent fix for memory leaks forgot to clear the error path that > already does vfree() for the elf headers. This may result in a > double-free. > > Drop the superfluous vfree() call at the error path of > crash_load_segments(). > > Fixes: b3e34a47f989 ("x86/kexec: fix memory leak of elf header buffer") > Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> --- > arch/x86/kernel/crash.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c > index 9730c88530fc..305514431f26 100644 > --- a/arch/x86/kernel/crash.c > +++ b/arch/x86/kernel/crash.c > @@ -401,10 +401,8 @@ int crash_load_segments(struct kimage *image) > kbuf.buf_align = ELF_CORE_HEADER_ALIGN; > kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; > ret = kexec_add_buffer(&kbuf); > - if (ret) { > - vfree((void *)image->elf_headers); > + if (ret) > return ret; > - } > image->elf_load_addr = kbuf.mem; > pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n", > image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
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