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[Qemu-devel] [PATCH v2] bsd_user: Fix potential null pointer dereference
From: |
Stefan Weil |
Subject: |
[Qemu-devel] [PATCH v2] bsd_user: Fix potential null pointer dereference |
Date: |
Mon, 21 Nov 2011 21:06:22 +0100 |
This bug was spotted by cppcheck.
Using g_try_malloc0 (as does the linux-user code) fixes this.
v2:
Use g_free in bsdload.c, too. Thanks to Peter Maydell for this hint.
Signed-off-by: Stefan Weil <address@hidden>
---
bsd-user/bsdload.c | 2 +-
bsd-user/elfload.c | 5 ++---
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/bsd-user/bsdload.c b/bsd-user/bsdload.c
index 6d9bb6f..2abc713 100644
--- a/bsd-user/bsdload.c
+++ b/bsd-user/bsdload.c
@@ -196,7 +196,7 @@ 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);
}
diff --git a/bsd-user/elfload.c b/bsd-user/elfload.c
index 1ef1f97..1288884 100644
--- a/bsd-user/elfload.c
+++ b/bsd-user/elfload.c
@@ -641,8 +641,7 @@ 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;
@@ -696,7 +695,7 @@ 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;
}
--
1.7.2.5