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    Subject[PATCH AUTOSEL 5.0 008/262] swiotlb: add checks for the return value of memblock_alloc*()
    Date
    From: Mike Rapoport <rppt@linux.ibm.com>

    [ Upstream commit a0bf842e89a3842162aa8514b9bf4611c86fee10 ]

    Add panic() calls if memblock_alloc() returns NULL.

    The panic() format duplicates the one used by memblock itself and in
    order to avoid explosion with long parameters list replace open coded
    allocation size calculations with a local variable.

    Link: http://lkml.kernel.org/r/1548057848-15136-19-git-send-email-rppt@linux.ibm.com
    Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Christophe Leroy <christophe.leroy@c-s.fr>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Dennis Zhou <dennis@kernel.org>
    Cc: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: Greentime Hu <green.hu@gmail.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Guan Xuetao <gxt@pku.edu.cn>
    Cc: Guo Ren <guoren@kernel.org>
    Cc: Guo Ren <ren_guo@c-sky.com> [c-sky]
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: Juergen Gross <jgross@suse.com> [Xen]
    Cc: Mark Salter <msalter@redhat.com>
    Cc: Matt Turner <mattst88@gmail.com>
    Cc: Max Filippov <jcmvbkbc@gmail.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Michal Simek <monstr@monstr.eu>
    Cc: Paul Burton <paul.burton@mips.com>
    Cc: Petr Mladek <pmladek@suse.com>
    Cc: Richard Weinberger <richard@nod.at>
    Cc: Rich Felker <dalias@libc.org>
    Cc: Rob Herring <robh+dt@kernel.org>
    Cc: Rob Herring <robh@kernel.org>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Stafford Horne <shorne@gmail.com>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Vineet Gupta <vgupta@synopsys.com>
    Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    kernel/dma/swiotlb.c | 19 +++++++++++++------
    1 file changed, 13 insertions(+), 6 deletions(-)

    diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
    index c873f9cc2146..41224f0ec40e 100644
    --- a/kernel/dma/swiotlb.c
    +++ b/kernel/dma/swiotlb.c
    @@ -191,6 +191,7 @@ void __init swiotlb_update_mem_attributes(void)
    int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
    {
    unsigned long i, bytes;
    + size_t alloc_size;

    bytes = nslabs << IO_TLB_SHIFT;

    @@ -203,12 +204,18 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
    * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
    * between io_tlb_start and io_tlb_end.
    */
    - io_tlb_list = memblock_alloc(
    - PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
    - PAGE_SIZE);
    - io_tlb_orig_addr = memblock_alloc(
    - PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
    - PAGE_SIZE);
    + alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(int));
    + io_tlb_list = memblock_alloc(alloc_size, PAGE_SIZE);
    + if (!io_tlb_list)
    + panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
    + __func__, alloc_size, PAGE_SIZE);
    +
    + alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t));
    + io_tlb_orig_addr = memblock_alloc(alloc_size, PAGE_SIZE);
    + if (!io_tlb_orig_addr)
    + panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
    + __func__, alloc_size, PAGE_SIZE);
    +
    for (i = 0; i < io_tlb_nslabs; i++) {
    io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
    io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
    --
    2.19.1
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