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authorJialiang Wang <wangjialiang0806@163.com>2022-08-10 15:30:57 +0800
committerJakub Kicinski <kuba@kernel.org>2022-08-11 09:02:26 -0700
commit02e1a114fdb71e59ee6770294166c30d437bf86a (patch)
treeab23ad2c451d5aba3d75fca3b1675b798ef9e255 /drivers
parentcef8e3261b4c8003f8a28276f8c74d7d0223e289 (diff)
nfp: fix use-after-free in area_cache_get()
area_cache_get() is used to distribute cache->area and set cache->id, and if cache->id is not 0 and cache->area->kref refcount is 0, it will release the cache->area by nfp_cpp_area_release(). area_cache_get() set cache->id before cpp->op->area_init() and nfp_cpp_area_acquire(). But if area_init() or nfp_cpp_area_acquire() fails, the cache->id is is already set but the refcount is not increased as expected. At this time, calling the nfp_cpp_area_release() will cause use-after-free. To avoid the use-after-free, set cache->id after area_init() and nfp_cpp_area_acquire() complete successfully. Note: This vulnerability is triggerable by providing emulated device equipped with specified configuration. BUG: KASAN: use-after-free in nfp6000_area_init (drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c:760) Write of size 4 at addr ffff888005b7f4a0 by task swapper/0/1 Call Trace: <TASK> nfp6000_area_init (drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c:760) area_cache_get.constprop.8 (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:884) Allocated by task 1: nfp_cpp_area_alloc_with_name (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:303) nfp_cpp_area_cache_add (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:802) nfp6000_init (drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c:1230) nfp_cpp_from_operations (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:1215) nfp_pci_probe (drivers/net/ethernet/netronome/nfp/nfp_main.c:744) Freed by task 1: kfree (mm/slub.c:4562) area_cache_get.constprop.8 (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:873) nfp_cpp_read (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:924 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:973) nfp_cpp_readl (drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpplib.c:48) Signed-off-by: Jialiang Wang <wangjialiang0806@163.com> Reviewed-by: Yinjun Zhang <yinjun.zhang@corigine.com> Acked-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/20220810073057.4032-1-wangjialiang0806@163.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
index 34c0d2ddf9ef..a8286d0032d1 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
@@ -874,7 +874,6 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
}
/* Adjust the start address to be cache size aligned */
- cache->id = id;
cache->addr = addr & ~(u64)(cache->size - 1);
/* Re-init to the new ID and address */
@@ -894,6 +893,8 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
return NULL;
}
+ cache->id = id;
+
exit:
/* Adjust offset */
*offset = addr - cache->addr;

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