[Xen-devel] [PATCH 06/16] libelf/xc_dom_load_elf_symtab: Do not use "syms" uninitialised

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

xc_dom_load_elf_symtab (with load==0) calls elf_round_up, but it
mistakenly used the uninitialised variable "syms" when calculating
dom->bsd_symtab_start.  This should be a reference to "elf".

This change might have the effect of rounding the value differently.
Previously if the uninitialised value (a single byte on the stack) was
ELFCLASS64 (ie, 2), the alignment would be to 8 bytes, otherwise to 4.

However, the value is calculated from dom->kernel_seg.vend so this
could only make a difference if that value wasn't already aligned to 8
bytes.

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

v2: Split this change into its own patch for proper review.
---
 tools/libxc/xc_dom_elfloader.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/libxc/xc_dom_elfloader.c b/tools/libxc/xc_dom_elfloader.c
index 6583859..d2fc977 100644
--- a/tools/libxc/xc_dom_elfloader.c
+++ b/tools/libxc/xc_dom_elfloader.c
@@ -141,7 +141,7 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image *dom,
         hdr = xc_dom_malloc(dom, size);
         if ( hdr == NULL )
             return 0;
-        dom->bsd_symtab_start = elf_round_up(&syms, dom->kernel_seg.vend);
+        dom->bsd_symtab_start = elf_round_up(elf, dom->kernel_seg.vend);
     }
 
     memcpy(hdr + sizeof(int),
-- 
1.7.2.5


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