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PR28518: signed integer overflow & free on unmalloced address

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PR 28518
	* vms-alpha.c (build_module_list): Don't lose malloc buffer address.
	Use unsigned variables.
This commit is contained in:
Alan Modra
2021-10-30 18:42:00 +10:30
parent fb9f44d410
commit 3c8ed65a5d
1 changed files with 10 additions and 10 deletions
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20
bfd/vms-alpha.c
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@ -4794,26 +4794,26 @@ build_module_list (bfd *abfd)
since we can compute the start address and the end address
of every module from the section contents. */
bfd_size_type size = bfd_section_size (dmt);
unsigned char *ptr, *end;
unsigned char *buf, *ptr, *end;
if (! bfd_malloc_and_get_section (abfd, dmt, &ptr))
if (! bfd_malloc_and_get_section (abfd, dmt, &buf))
return NULL;
vms_debug2 ((2, "DMT\n"));
ptr = buf;
end = ptr + size;
while (end - ptr >= DBG_S_C_DMT_HEADER_SIZE)
{
/* Each header declares a module with its start offset and size
of debug info in the DST section, as well as the count of
program sections (i.e. address spans) it contains. */
int modbeg = bfd_getl32 (ptr + DBG_S_L_DMT_MODBEG);
int msize = bfd_getl32 (ptr + DBG_S_L_DST_SIZE);
unsigned int modbeg = bfd_getl32 (ptr + DBG_S_L_DMT_MODBEG);
unsigned int msize = bfd_getl32 (ptr + DBG_S_L_DST_SIZE);
int count = bfd_getl16 (ptr + DBG_S_W_DMT_PSECT_COUNT);
ptr += DBG_S_C_DMT_HEADER_SIZE;
vms_debug2 ((3, "module: modbeg = %d, size = %d, count = %d\n",
vms_debug2 ((3, "module: modbeg = %u, size = %u, count = %d\n",
modbeg, msize, count));
/* We create a 'module' structure for each program section since
@ -4823,8 +4823,8 @@ build_module_list (bfd *abfd)
cause problems in practice. */
while (count-- > 0 && end - ptr >= DBG_S_C_DMT_PSECT_SIZE)
{
int start = bfd_getl32 (ptr + DBG_S_L_DMT_PSECT_START);
int length = bfd_getl32 (ptr + DBG_S_L_DMT_PSECT_LENGTH);
unsigned int start = bfd_getl32 (ptr + DBG_S_L_DMT_PSECT_START);
unsigned int length = bfd_getl32 (ptr + DBG_S_L_DMT_PSECT_LENGTH);
module = new_module (abfd);
module->modbeg = modbeg;
module->size = msize;
@ -4834,11 +4834,11 @@ build_module_list (bfd *abfd)
list = module;
ptr += DBG_S_C_DMT_PSECT_SIZE;
vms_debug2 ((4, "section: start = 0x%x, length = %d\n",
vms_debug2 ((4, "section: start = 0x%x, length = %u\n",
start, length));
}
}
free (ptr);
free (buf);
}
else
{