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From 344a8364cb05cdaafc43231d0f73d5217c4e118c Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Tue, 12 Feb 2019 18:04:49 -0500
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Subject: [PATCH 28/62] VLogError(): Avoid NULL pointer dereferences in
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(V)Sprint calls
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VLogError() calculates the size of format strings by using calls to
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SPrint and VSPrint with a StrSize of 0 and NULL for an output buffer.
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Unfortunately, this is an incorrect usage of (V)Sprint. A StrSize
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of "0" is special-cased to mean "there is no limit". So, we end up
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writing our string to address 0x0. This was discovered because it
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causes a crash on ARM where, unlike x86, it does not necessarily
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have memory mapped at 0x0.
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Avoid the (V)Sprint calls altogether by using (V)PoolPrint, which
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handles the size calculation and allocation for us.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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Fixes: 25f6fd08cd26 ("try to show errors more usefully.")
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[dannf: commit message ]
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Signed-off-by: dann frazier <dann.frazier@canonical.com>
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Upstream-commit-id: 20e731f423a
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---
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errlog.c | 15 +++------------
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1 file changed, 3 insertions(+), 12 deletions(-)
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diff --git a/errlog.c b/errlog.c
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index 18be4822d53..eebb266d396 100644
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--- a/errlog.c
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+++ b/errlog.c
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@@ -14,29 +14,20 @@ EFI_STATUS
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VLogError(const char *file, int line, const char *func, CHAR16 *fmt, va_list args)
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{
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va_list args2;
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- UINTN size = 0, size2;
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CHAR16 **newerrs;
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- size = SPrint(NULL, 0, L"%a:%d %a() ", file, line, func);
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- va_copy(args2, args);
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- size2 = VSPrint(NULL, 0, fmt, args2);
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- va_end(args2);
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-
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newerrs = ReallocatePool(errs, (nerrs + 1) * sizeof(*errs),
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(nerrs + 3) * sizeof(*errs));
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if (!newerrs)
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return EFI_OUT_OF_RESOURCES;
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- newerrs[nerrs] = AllocatePool(size*2+2);
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+ newerrs[nerrs] = PoolPrint(L"%a:%d %a() ", file, line, func);
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if (!newerrs[nerrs])
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return EFI_OUT_OF_RESOURCES;
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- newerrs[nerrs+1] = AllocatePool(size2*2+2);
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+ va_copy(args2, args);
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+ newerrs[nerrs+1] = VPoolPrint(fmt, args2);
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if (!newerrs[nerrs+1])
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return EFI_OUT_OF_RESOURCES;
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-
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- SPrint(newerrs[nerrs], size*2+2, L"%a:%d %a() ", file, line, func);
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- va_copy(args2, args);
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- VSPrint(newerrs[nerrs+1], size2*2+2, fmt, args2);
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va_end(args2);
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nerrs += 2;
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--
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2.26.2
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