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[syslinux] fallback to embedded on version match if download fails

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* Could be useful for current tails user (6.03 based, same as ours)
  who want to create an UFD without downloading files.
* Also improve the buffer overflow check in syslinux/libinstaller/syslxmod.c
This commit is contained in:
Pete Batard 2016-03-08 17:28:45 +00:00
parent 1cc7fca4c5
commit a10a207790
3 changed files with 17 additions and 12 deletions
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10
src/syslinux/libinstaller/syslxmod.c
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@ -122,11 +122,11 @@ int syslinux_patch(const sector_t *sectp, int nsectors,
return -1; /* The actual file is too small for content */
/* Search for LDLINUX_MAGIC to find the patch area */
for (wp = (const uint32_t _slimg *)boot_image;
(get_32_sl(wp) != LDLINUX_MAGIC) && (((uintptr_t)wp) < ((uintptr_t)boot_image + boot_image_len));
wp++)
;
if (((uintptr_t)wp) >= ((uintptr_t)boot_image + boot_image_len))
dw = (boot_image_len - sizeof(struct patch_area)) >> 2;
for (i = 0, wp = (const uint32_t _slimg *)boot_image;
(i <= dw) && ((get_32_sl(wp) != LDLINUX_MAGIC));
i++, wp++)
if (i > dw) /* Not found */
return -1;
patcharea = (struct patch_area _slimg *)wp;
epa = slptr(boot_image, &patcharea->epaoffset);