mm/percpu: add checks for the return value of memblock_alloc*()

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/1548057848-15136-17-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>

diff --git a/mm/percpu.c b/mm/percpu.c
index c5c750781628d7a793488dc8fd7d62019932bf90..3f9fb3086a9b1cd2ed6839664eb65738e2a57225 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1086,6 +1086,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
        struct pcpu_chunk *chunk;
        unsigned long aligned_addr, lcm_align;
        int start_offset, offset_bits, region_size, region_bits;
+       size_t alloc_size;
 
        /* region calculations */
        aligned_addr = tmp_addr & PAGE_MASK;
@@ -1101,9 +1102,12 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
        region_size = ALIGN(start_offset + map_size, lcm_align);
 
        /* allocate chunk */
-       chunk = memblock_alloc(sizeof(struct pcpu_chunk) +
-                              BITS_TO_LONGS(region_size >> PAGE_SHIFT),
-                              SMP_CACHE_BYTES);
+       alloc_size = sizeof(struct pcpu_chunk) +
+               BITS_TO_LONGS(region_size >> PAGE_SHIFT);
+       chunk = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!chunk)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
 
        INIT_LIST_HEAD(&chunk->list);
 
@@ -1114,12 +1118,25 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,
        chunk->nr_pages = region_size >> PAGE_SHIFT;
        region_bits = pcpu_chunk_map_bits(chunk);
 
-       chunk->alloc_map = memblock_alloc(BITS_TO_LONGS(region_bits) * sizeof(chunk->alloc_map[0]),
-                                         SMP_CACHE_BYTES);
-       chunk->bound_map = memblock_alloc(BITS_TO_LONGS(region_bits + 1) * sizeof(chunk->bound_map[0]),
-                                         SMP_CACHE_BYTES);
-       chunk->md_blocks = memblock_alloc(pcpu_chunk_nr_blocks(chunk) * sizeof(chunk->md_blocks[0]),
-                                         SMP_CACHE_BYTES);
+       alloc_size = BITS_TO_LONGS(region_bits) * sizeof(chunk->alloc_map[0]);
+       chunk->alloc_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!chunk->alloc_map)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
+       alloc_size =
+               BITS_TO_LONGS(region_bits + 1) * sizeof(chunk->bound_map[0]);
+       chunk->bound_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!chunk->bound_map)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
+       alloc_size = pcpu_chunk_nr_blocks(chunk) * sizeof(chunk->md_blocks[0]);
+       chunk->md_blocks = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!chunk->md_blocks)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
        pcpu_init_md_blocks(chunk);
 
        /* manage populated page bitmap */
@@ -2044,6 +2061,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
        int group, unit, i;
        int map_size;
        unsigned long tmp_addr;
+       size_t alloc_size;
 
 #define PCPU_SETUP_BUG_ON(cond)        do {                                    \
        if (unlikely(cond)) {                                           \
@@ -2075,14 +2093,29 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
        PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0);
 
        /* process group information and build config tables accordingly */
-       group_offsets = memblock_alloc(ai->nr_groups * sizeof(group_offsets[0]),
-                                      SMP_CACHE_BYTES);
-       group_sizes = memblock_alloc(ai->nr_groups * sizeof(group_sizes[0]),
-                                    SMP_CACHE_BYTES);
-       unit_map = memblock_alloc(nr_cpu_ids * sizeof(unit_map[0]),
-                                 SMP_CACHE_BYTES);
-       unit_off = memblock_alloc(nr_cpu_ids * sizeof(unit_off[0]),
-                                 SMP_CACHE_BYTES);
+       alloc_size = ai->nr_groups * sizeof(group_offsets[0]);
+       group_offsets = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!group_offsets)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
+       alloc_size = ai->nr_groups * sizeof(group_sizes[0]);
+       group_sizes = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!group_sizes)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
+       alloc_size = nr_cpu_ids * sizeof(unit_map[0]);
+       unit_map = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!unit_map)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
+
+       alloc_size = nr_cpu_ids * sizeof(unit_off[0]);
+       unit_off = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
+       if (!unit_off)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     alloc_size);
 
        for (cpu = 0; cpu < nr_cpu_ids; cpu++)
                unit_map[cpu] = UINT_MAX;
@@ -2148,6 +2181,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
        pcpu_nr_slots = __pcpu_size_to_slot(pcpu_unit_size) + 2;
        pcpu_slot = memblock_alloc(pcpu_nr_slots * sizeof(pcpu_slot[0]),
                                   SMP_CACHE_BYTES);
+       if (!pcpu_slot)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     pcpu_nr_slots * sizeof(pcpu_slot[0]));
        for (i = 0; i < pcpu_nr_slots; i++)
                INIT_LIST_HEAD(&pcpu_slot[i]);
 
@@ -2602,6 +2638,9 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
        pages_size = PFN_ALIGN(unit_pages * num_possible_cpus() *
                               sizeof(pages[0]));
        pages = memblock_alloc(pages_size, SMP_CACHE_BYTES);
+       if (!pages)
+               panic("%s: Failed to allocate %zu bytes\n", __func__,
+                     pages_size);
 
        /* allocate pages */
        j = 0;