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author | Rusty Russell <rusty@rustcorp.com.au> | 2012-12-10 23:08:33 (GMT) |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2012-12-14 02:36:43 (GMT) |
commit | 82fab442f5322b016f72891c0db2436c6a6c20b7 (patch) | |
tree | 1b55bbf22569cf721c4bc13dc8f96652bad50a26 /arch | |
parent | 54523ec71f8ce99accae97c74152f14f261f7e18 (diff) | |
download | linux-fsl-qoriq-82fab442f5322b016f72891c0db2436c6a6c20b7.tar.xz |
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 37400f5..51123f9 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 5e34ccf..2a625fb 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 f1ddc0d..4435488 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 243ffeb..4918d91 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 8fbe857..16bd149 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; |