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| author |   Helge Deller <deller@gmx.de> | 2020-05-28 22:29:25 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2020-05-29 15:47:55 +0200 |
| commit | bf71bc16e02162388808949b179d59d0b571b965 (patch) | |
| tree | 8825456571a4d0838ba901fac67f68f71342982a /arch/parisc | |
| parent | Merge tag 'fsnotify_for_v5.7-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs (diff) | |
| download | linux-dev-bf71bc16e02162388808949b179d59d0b571b965.tar.xz linux-dev-bf71bc16e02162388808949b179d59d0b571b965.zip | |
parisc: Fix kernel panic in mem_init()
The Debian kernel v5.6 triggers this kernel panic:
Kernel panic - not syncing: Bad Address (null pointer deref?)
Bad Address (null pointer deref?): Code=26 (Data memory access rights trap) at addr 0000000000000000
CPU: 0 PID: 0 Comm: swapper Not tainted 5.6.0-2-parisc64 #1 Debian 5.6.14-1
IAOQ[0]: mem_init+0xb0/0x150
IAOQ[1]: mem_init+0xb4/0x150
RP(r2): start_kernel+0x6c8/0x1190
Backtrace:
[<0000000040101ab4>] start_kernel+0x6c8/0x1190
[<0000000040108574>] start_parisc+0x158/0x1b8
on a HP-PARISC rp3440 machine with this memory layout:
Memory Ranges:
0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB
1) Start 0x0000004040000000 End 0x00000040ffdfffff Size 3070 MB
Fix the crash by avoiding virt_to_page() and similar functions in
mem_init() until the memory zones have been fully set up.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.0+
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/mm/init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 5224fb38d766..01d7071b23f7 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -562,7 +562,7 @@ void __init mem_init(void) > BITS_PER_LONG); high_memory = __va((max_pfn << PAGE_SHIFT)); - set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1); + set_max_mapnr(max_low_pfn); memblock_free_all(); #ifdef CONFIG_PA11 |