On Sat, Oct 20, 2018 at 11:37 PM Or Gerlitz <gerlitz.or@xxxxxxxxx> wrote: > On Fri, Oct 19, 2018 at 11:08 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote: > > FDB_MAX_CHAIN is 3. We wanted to allocate enough memory to hold four > > structs but there are missing parentheses so we only allocate enough > > memory for three structs and the first byte of the fourth one. > > yeah, seems that we were wrong here and the fix is correct, at some > point I saw Kasan screams but it was gone later, let me look, thanks for pointing it out. OK, here's the kasan note: [ 289.005141] BUG: KASAN: slab-out-of-bounds in mlx5_init_fs+0x6a7/0x1176 [mlx5_core] [ 289.005244] Write of size 8 at addr ffff8806cfb70e58 by task modprobe/6186 my .config was like this w.r.t kasan: CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000 CONFIG_HAVE_ARCH_KASAN=y CONFIG_KASAN=y # CONFIG_KASAN_EXTRA is not set CONFIG_KASAN_OUTLINE=y # CONFIG_KASAN_INLINE is not set # CONFIG_TEST_KASAN is not set where now, when I changed it to be: CONFIG_KASAN_SHADOW_OFFSET=0xdffffc0000000000 CONFIG_HAVE_ARCH_KASAN=y CONFIG_KASAN=y CONFIG_KASAN_EXTRA=y # CONFIG_KASAN_OUTLINE is not set CONFIG_KASAN_INLINE=y # CONFIG_TEST_KASAN is not set Kasan is there to spot the bug. I will re-post your patch, this time to netdev since the original commit is there and so should be the fix, thanks for reporting/fixing! Or.
