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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-23 15:02:54 +0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-23 15:36:28 +0400
commit0c9ae701ae1caf657326db22d61074b40a747c9d (patch)
tree97eccc9b9941e71c471b5b3f32450c89f476093f /drivers/firewire/core-transaction.c
parentcc550216ae9a2993ef3973464714dc1a39ab1f86 (diff)
downloadlinux-0c9ae701ae1caf657326db22d61074b40a747c9d.tar.xz
firewire: core: fix upper bound of possible CSR allocations
region->end is defined as an upper bound of the requested address range, exclusive --- i.e. as an address outside of the range in which the requested CSR is to be placed. Hence 0x0001,0000,0000,0000 is the biggest valid region->end, not 0x0000,ffff,ffff,fffc like the current check asserted. For simplicity, the fix drops the region->end & 3 test because there is no actual problem with these bits set in region->end. The allocated address range will be quadlet aligned and of a size of multiple quadlets due to the checks for region->start & 3 and handler->length & 3 alone. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core-transaction.c')
-rw-r--r--drivers/firewire/core-transaction.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 6f225cacbc3d..ca7ca56661e0 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -543,8 +543,8 @@ int fw_core_add_address_handler(struct fw_address_handler *handler,
int ret = -EBUSY;
if (region->start & 0xffff000000000003ULL ||
- region->end & 0xffff000000000003ULL ||
region->start >= region->end ||
+ region->end > 0x0001000000000000ULL ||
handler->length & 3 ||
handler->length == 0)
return -EINVAL;