On 8/27/25 12:23 AM, Oscar Maes wrote:
Commit 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes") introduced a regression where local-broadcast packets would have their gateway set in __mkroute_output, which was caused by fi = NULL being removed.
Fix this by resetting the fib_info for local-broadcast packets. This preserves the intended changes for directed-broadcast packets.
Cc: stable@vger.kernel.org Fixes: 9e30ecf23b1b ("net: ipv4: fix incorrect MTU in broadcast routes") Reported-by: Brett A C Sheffield bacs@librecast.net Closes: https://lore.kernel.org/regressions/20250822165231.4353-4-bacs@librecast.net Signed-off-by: Oscar Maes oscmaes92@gmail.com
Link to discussion: https://lore.kernel.org/netdev/20250822165231.4353-4-bacs@librecast.net/
Thanks to Brett Sheffield for finding the regression and writing the initial fix!
net/ipv4/route.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
Reviewed-by: David Ahern dsahern@kernel.org