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xsk: fix an integer overflow in xp_create_and_assign_umem() 

commit 559847f567 upstream.

Since the i and pool->chunk_size variables are of type 'u32',
their product can wrap around and then be cast to 'u64'.
This can lead to two different XDP buffers pointing to the same
memory area.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: 94033cd8e7 ("xsk: Optimize for aligned case")
Cc: stable@vger.kernel.org
Signed-off-by: Ilia Gavrilov <Ilia.Gavrilov@infotecs.ru>
Link: https://patch.msgid.link/20250313085007.3116044-1-Ilia.Gavrilov@infotecs.ru
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b7b4be1fa43294b50b22e812715198629806678a)
This commit is contained in:
Gavrilov Ilia 2025-03-13 08:50:08 +00:00 committed by Wentao Guan
parent 7508023926
commit 34fa18dac4
1 changed files with 1 additions and 1 deletions
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2
net/xdp/xsk_buff_pool.c
View File

@ -104,7 +104,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
if (pool->unaligned)
pool->free_heads[i] = xskb;
else
xp_init_xskb_addr(xskb, pool, i * pool->chunk_size);
xp_init_xskb_addr(xskb, pool, (u64)i * pool->chunk_size);
}
return pool;