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| author | Florian Westphal <fw@strlen.de> | 2022-09-26 17:16:50 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-30 18:46:31 -0700 |
| commit | 30c19366636f72515679aa10dad61a4d988d4c9a (patch) | |
| tree | 80a930c7809c93e8594745dc4fa62de8237e5e6f | |
| parent | b674deddeb49fd37b8f20a15b658abde6671e2a8 (diff) | |
| download | lwn-30c19366636f72515679aa10dad61a4d988d4c9a.tar.gz lwn-30c19366636f72515679aa10dad61a4d988d4c9a.zip | |
mm: fix BUG splat with kvmalloc + GFP_ATOMIC
Martin Zaharinov reports BUG with 5.19.10 kernel:
kernel BUG at mm/vmalloc.c:2437!
invalid opcode: 0000 [#1] SMP
CPU: 28 PID: 0 Comm: swapper/28 Tainted: G W O 5.19.9 #1
[..]
RIP: 0010:__get_vm_area_node+0x120/0x130
__vmalloc_node_range+0x96/0x1e0
kvmalloc_node+0x92/0xb0
bucket_table_alloc.isra.0+0x47/0x140
rhashtable_try_insert+0x3a4/0x440
rhashtable_insert_slow+0x1b/0x30
[..]
bucket_table_alloc uses kvzalloc(GPF_ATOMIC). If kmalloc fails, this now
falls through to vmalloc and hits code paths that assume GFP_KERNEL.
Link: https://lkml.kernel.org/r/20220926151650.15293-1-fw@strlen.de
Fixes: a421ef303008 ("mm: allow !GFP_KERNEL allocations for kvmalloc")
Signed-off-by: Florian Westphal <fw@strlen.de>
Suggested-by: Michal Hocko <mhocko@suse.com>
Link: https://lore.kernel.org/linux-mm/Yy3MS2uhSgjF47dy@pc636/T/#t
Acked-by: Michal Hocko <mhocko@suse.com>
Reported-by: Martin Zaharinov <micron10@gmail.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/util.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index c9439c66d8cf..346e40177bc6 100644 --- a/mm/util.c +++ b/mm/util.c @@ -619,6 +619,10 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node) if (ret || size <= PAGE_SIZE) return ret; + /* non-sleeping allocations are not supported by vmalloc */ + if (!gfpflags_allow_blocking(flags)) + return NULL; + /* Don't even allow crazy sizes */ if (unlikely(size > INT_MAX)) { WARN_ON_ONCE(!(flags & __GFP_NOWARN)); |