diff options
| author | Robert Hentosh | 2006-05-30 22:48:00 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2006-05-30 20:31:06 -0700 |
| commit | 7ca97c6131dac9f06b1856a95a2ec89d43844286 (patch) | |
| tree | c69a7dc3a48b9bc9dbb19f08fd48bc0275bbf792 | |
| parent | 0d01532451710110a93891ae152d1dd1ee006ccf (diff) | |
[PATCH] x86_64: Fix off by one in bad_addr checking in find_e820_area
From: Robert Hentosh <robert_hentosh@dell.com>
Actually, we just stumbled on a different bug found in find_e820_area() in
e820.c. The following code does not handle the edge condition correctly:
while (bad_addr(&addr, size) && addr+size < ei->addr + ei->size)
;
last = addr + size;
if ( last > ei->addr + ei->size )
continue;
The second statement in the while loop needs to be a <= b so that it is the
logical negavite of the if (a > b) outside it. It needs to read:
while (bad_addr(&addr, size) && addr+size <= ei->addr + ei->size)
;
In the case that failed bad_addr was returning an address that is exactly size
bellow the end of the e820 range.
AK: Again together with the earlier avoid edma fix this fixes
boot on a Dell PE6850/16GB
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/e820.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c index 222b5b46d2b2..1ef6028f721e 100644 --- a/arch/x86_64/kernel/e820.c +++ b/arch/x86_64/kernel/e820.c @@ -149,7 +149,7 @@ unsigned long __init find_e820_area(unsigned long start, unsigned long end, unsi addr = start; if (addr > ei->addr + ei->size) continue; - while (bad_addr(&addr, size) && addr+size < ei->addr + ei->size) + while (bad_addr(&addr, size) && addr+size <= ei->addr+ei->size) ; last = addr + size; if (last > ei->addr + ei->size) |