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x86/boot/compressed/64: Fix missing initialization in find_trampoline_placement()

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[ Upstream commit c96e8483cb ]

Gustavo noticed that 'new' can be left uninitialized if 'bios_start'
happens to be less or equal to 'entry->addr + entry->size'.

Initialize the variable at the begin of the iteration to the current value
of 'bios_start'.

Fixes: 0a46fff2f9 ("x86/boot/compressed/64: Fix boot on machines with broken E820 table")
Reported-by: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190826133326.7cxb4vbmiawffv2r@box
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2019-08-26 16:26:01 +03:00 committed by Greg Kroah-Hartman
parent b8727dff55
commit 5049632bc9
1 changed files with 1 additions and 1 deletions
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2
arch/x86/boot/compressed/pgtable_64.c
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@ -73,7 +73,7 @@ static unsigned long find_trampoline_placement(void)
/* Find the first usable memory region under bios_start. */
for (i = boot_params->e820_entries - 1; i >= 0; i--) {
unsigned long new;
unsigned long new = bios_start;
entry = &boot_params->e820_table[i];