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linux-user/elfload.c: Don't memset(NULL..) if malloc() failed 

If a malloc() in copy_elf_strings() failed we would call memset()
before the "did malloc fail?" check. Fix this by moving to the
glib alloc/free routines for this memory so we can use g_try_malloc0
rather than having a separate memset(). Spotted by Coverity (see
bug 887883).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Maydell 2011-11-09 19:22:11 +00:00 committed by Anthony Liguori
parent 096685fc2a
commit 7dd47667b9
2 changed files with 3 additions and 4 deletions
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5
linux-user/elfload.c
View File

@ -1105,8 +1105,7 @@ static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
offset = p % TARGET_PAGE_SIZE;
pag = (char *)page[p/TARGET_PAGE_SIZE];
if (!pag) {
pag = (char *)malloc(TARGET_PAGE_SIZE);
memset(pag, 0, TARGET_PAGE_SIZE);
pag = g_try_malloc0(TARGET_PAGE_SIZE);
page[p/TARGET_PAGE_SIZE] = pag;
if (!pag)
return 0;
@ -1164,7 +1163,7 @@ static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
info->rss++;
/* FIXME - check return value of memcpy_to_target() for failure */
memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
free(bprm->page[i]);
g_free(bprm->page[i]);
}
stack_base += TARGET_PAGE_SIZE;
}

2
linux-user/linuxload.c
View File

@ -178,7 +178,7 @@ int loader_exec(const char * filename, char ** argv, char ** envp,
/* Something went wrong, return the inode and free the argument pages*/
for (i=0 ; i<MAX_ARG_PAGES ; i++) {
free(bprm->page[i]);
g_free(bprm->page[i]);
}
return(retval);
}