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From 81b79c514ff6fc881f1df4cb04ecb2d7cb22badc Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 19 Feb 2020 12:48:13 -0500
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Subject: [PATCH] [PATCH] Avoid false-positive failure in mem_seciton
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validation
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Currently in get_mem_section(), we check whether SYMBOL(mem_section)
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is a pointer to the array or a pointer to the pointer to the array
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for some cases.
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However, with commit e113f1c974c8 ("[PATCH] cope with not-present
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mem section") relaxing the check, there was a report that the function
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failed because both of two validate_mem_section() calls return TRUE.
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Avoid the false-positive failure by not calling the second one if the
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first one returns TRUE.
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Reported-by: Pingfan Liu <piliu@redhat.com>
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Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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makedumpfile.c | 29 ++++++-----------------------
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1 file changed, 6 insertions(+), 23 deletions(-)
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diff --git a/makedumpfile-1.6.7/makedumpfile.c b/makedumpfile-1.6.7/makedumpfile.c
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index f5860a1..4c4251e 100644
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--- a/makedumpfile-1.6.7/makedumpfile.c
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+++ b/makedumpfile-1.6.7/makedumpfile.c
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@@ -3472,7 +3472,6 @@ static int
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get_mem_section(unsigned int mem_section_size, unsigned long *mem_maps,
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unsigned int num_section)
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{
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- unsigned long mem_section_ptr;
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int ret = FALSE;
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unsigned long *mem_sec = NULL;
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@@ -3484,34 +3483,18 @@ get_mem_section(unsigned int mem_section_size, unsigned long *mem_maps,
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ret = validate_mem_section(mem_sec, SYMBOL(mem_section),
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mem_section_size, mem_maps, num_section);
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- if (is_sparsemem_extreme()) {
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- int symbol_valid = ret;
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- int pointer_valid;
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- int mem_maps_size = sizeof(*mem_maps) * num_section;
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- unsigned long *mem_maps_ex = NULL;
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+ if (!ret && is_sparsemem_extreme()) {
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+ unsigned long mem_section_ptr;
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+
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if (!readmem(VADDR, SYMBOL(mem_section), &mem_section_ptr,
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sizeof(mem_section_ptr)))
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goto out;
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- if ((mem_maps_ex = malloc(mem_maps_size)) == NULL) {
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- ERRMSG("Can't allocate memory for the mem_maps. %s\n",
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- strerror(errno));
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- goto out;
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- }
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+ ret = validate_mem_section(mem_sec, mem_section_ptr,
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+ mem_section_size, mem_maps, num_section);
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- pointer_valid = validate_mem_section(mem_sec,
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- mem_section_ptr,
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- mem_section_size,
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- mem_maps_ex,
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- num_section);
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- if (pointer_valid)
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- memcpy(mem_maps, mem_maps_ex, mem_maps_size);
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- if (mem_maps_ex)
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- free(mem_maps_ex);
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- ret = symbol_valid ^ pointer_valid;
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- if (!ret) {
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+ if (!ret)
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ERRMSG("Could not validate mem_section.\n");
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- }
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}
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out:
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if (mem_sec != NULL)
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--
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2.7.5
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