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| author |   Allan Stephens <Allan.Stephens@windriver.com> | 2011-01-18 13:24:55 -0500 |
|---|---|---|
| committer |   Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-02-23 18:05:09 -0500 |
| commit | 5413b4c6c07b659e52c84a4e40d897b32b89834f (patch) | |
| tree | a0f108cc7396f0a715ed36cd1d6b2636c52798b1 /net/tipc | |
| parent | tipc: Prevent invalid memory access when sending to configuration service (diff) | |
| download | linux-dev-5413b4c6c07b659e52c84a4e40d897b32b89834f.tar.xz linux-dev-5413b4c6c07b659e52c84a4e40d897b32b89834f.zip | |
tipc: Improve handling of invalid link tolerance values
Enhances TIPC link code to ignore an invalid link tolerance value
contained in an incoming LINK_PROTOCOL message, rather than
processing the value and potentially causing a divide-by-zero error.
Also add a compile-time check that catches attempts to redefine
TIPC's minimum link tolerance value in a manner that might result
in the same divide-by-zero error at run-time.
Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net/tipc')
| -rw-r--r-- | net/tipc/link.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 1c5c53a81531..3c1c28cdbaa4 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -2617,6 +2617,9 @@ static void link_check_defragm_bufs(struct link *l_ptr) static void link_set_supervision_props(struct link *l_ptr, u32 tolerance) { + if ((tolerance < TIPC_MIN_LINK_TOL) || (tolerance > TIPC_MAX_LINK_TOL)) + return; + l_ptr->tolerance = tolerance; l_ptr->continuity_interval = ((tolerance / 4) > 500) ? 500 : tolerance / 4; |