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| author | Rusty Russell <rusty@rustcorp.com.au> | 2012-12-11 09:38:33 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-12-14 13:06:43 +1030 |
| commit | 82fab442f5322b016f72891c0db2436c6a6c20b7 (patch) | |
| tree | 1b55bbf22569cf721c4bc13dc8f96652bad50a26 /arch | |
| parent | 54523ec71f8ce99accae97c74152f14f261f7e18 (diff) | |
| download | linux-82fab442f5322b016f72891c0db2436c6a6c20b7.tar.gz | |
modules: don't hand 0 to vmalloc.
In commit d0a21265dfb5fa8a David Rientjes unified various archs' module_alloc implementation (including x86) and removed the graduitous shortcut for size == 0. Then, in commit de7d2b567d040e3b, Joe Perches added a warning for zero-length vmallocs, which can happen without kallsyms on modules with no init sections (eg. zlib_deflate). Fix this once and for all; the module code has to handle zero length anyway, so get it right at the caller and remove the now-gratuitous checks within the arch-specific module_alloc implementations. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42608 Reported-by: Conrad Kostecki <ConiKost@gmx.de> Cc: David Rientjes <rientjes@google.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/cris/kernel/module.c | 2 | ||||
| -rw-r--r-- | arch/parisc/kernel/module.c | 2 | ||||
| -rw-r--r-- | arch/sparc/kernel/module.c | 4 | ||||
| -rw-r--r-- | arch/tile/kernel/module.c | 2 | ||||
| -rw-r--r-- | arch/unicore32/kernel/module.c | 3 |
5 files changed, 0 insertions, 13 deletions
diff --git a/arch/cris/kernel/module.c b/arch/cris/kernel/module.c index 37400f5869e6..51123f985eb5 100644 --- a/arch/cris/kernel/module.c +++ b/arch/cris/kernel/module.c @@ -32,8 +32,6 @@ #ifdef CONFIG_ETRAX_KMALLOCED_MODULES void *module_alloc(unsigned long size) { - if (size == 0) - return NULL; return kmalloc(size, GFP_KERNEL); } diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c index 5e34ccf39a49..2a625fb063e1 100644 --- a/arch/parisc/kernel/module.c +++ b/arch/parisc/kernel/module.c @@ -214,8 +214,6 @@ static inline int reassemble_22(int as22) void *module_alloc(unsigned long size) { - if (size == 0) - return NULL; /* using RWX means less protection for modules, but it's * easier than trying to map the text, data, init_text and * init_data correctly */ diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c index f1ddc0d23679..4435488ebe25 100644 --- a/arch/sparc/kernel/module.c +++ b/arch/sparc/kernel/module.c @@ -43,10 +43,6 @@ void *module_alloc(unsigned long size) { void *ret; - /* We handle the zero case fine, unlike vmalloc */ - if (size == 0) - return NULL; - ret = module_map(size); if (ret) memset(ret, 0, size); diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c index 243ffebe38d6..4918d91bc3a6 100644 --- a/arch/tile/kernel/module.c +++ b/arch/tile/kernel/module.c @@ -42,8 +42,6 @@ void *module_alloc(unsigned long size) int i = 0; int npages; - if (size == 0) - return NULL; npages = (size + PAGE_SIZE - 1) / PAGE_SIZE; pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL); if (pages == NULL) diff --git a/arch/unicore32/kernel/module.c b/arch/unicore32/kernel/module.c index 8fbe8577f5e6..16bd1495b934 100644 --- a/arch/unicore32/kernel/module.c +++ b/arch/unicore32/kernel/module.c @@ -27,9 +27,6 @@ void *module_alloc(unsigned long size) struct vm_struct *area; size = PAGE_ALIGN(size); - if (!size) - return NULL; - area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); if (!area) return NULL; |