From: Yanjiang Jin Date: Fri, 27 Feb 2015 05:30:34 +0000 (+0800) Subject: powerpc/mm: Free string after creating kmem cache X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e77553cb21adabb7680930e7b20c578cec7ae5a8;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git powerpc/mm: Free string after creating kmem cache kmem_cache_create()->kmem_cache_create_memcg()->kstrdup() allocates new space and copys name's content, so it is safe to free name memory after calling kmem_cache_create(). Else kmemleak will report the below warning: unreferenced object 0xc0000000f9002160 (size 16): comm "swapper/0", pid 0, jiffies 4294892296 (age 1386.640s) hex dump (first 16 bytes): 70 67 74 61 62 6c 65 2d 32 5e 39 00 de ad be ef pgtable-2^9..... backtrace: [] .kvasprintf+0x5c/0xa0 [] .kasprintf+0x2c/0x50 [] .pgtable_cache_add+0xac/0x100 [] .pgtable_cache_init+0x24/0x80 [] .start_kernel+0x228/0x4c8 [] .start_here_common+0x24/0x90 Signed-off-by: Yanjiang Jin Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 10471f9bb63f..d747dd7bc90b 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -132,6 +132,7 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *)) align = max_t(unsigned long, align, minalign); name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); new = kmem_cache_create(name, table_size, align, 0, ctor); + kfree(name); pgtable_cache[shift - 1] = new; pr_debug("Allocated pgtable cache for order %d\n", shift); }