From: Jacob Keller Date: Thu, 4 Feb 2016 18:47:54 +0000 (-0800) Subject: fm10k: prevent null pointer dereference of msix_entries table X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de66c610a6adade32bf955f67b4f4f4aaeeeff85;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git fm10k: prevent null pointer dereference of msix_entries table According to the C standard dereferencing a variable before it is checked invokes undefined behavior, and thus compilers are free to assume the check for NULL isn't necessary. Prevent this by re-ordering the NULL check of msix_entries in fm10k_free_mbx_irq. Signed-off-by: Jacob Keller Tested-by: Krishneil Singh Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index 6190a81b7c32..8c23fb3df572 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -1143,14 +1143,16 @@ static irqreturn_t fm10k_msix_mbx_pf(int __always_unused irq, void *data) void fm10k_mbx_free_irq(struct fm10k_intfc *interface) { - struct msix_entry *entry = &interface->msix_entries[FM10K_MBX_VECTOR]; struct fm10k_hw *hw = &interface->hw; + struct msix_entry *entry; int itr_reg; /* no mailbox IRQ to free if MSI-X is not enabled */ if (!interface->msix_entries) return; + entry = &interface->msix_entries[FM10K_MBX_VECTOR]; + /* disconnect the mailbox */ hw->mbx.ops.disconnect(hw, &hw->mbx);