Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ac2a659968f5318a180213f0409c2ea21f072820 Commit: ac2a659968f5318a180213f0409c2ea21f072820 Parent: 5aaf5f7b871abf00fb2525e7ed2d5938a74ce23c Author: Jeff Dike <[EMAIL PROTECTED]> AuthorDate: Fri Feb 8 04:22:11 2008 -0800 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Fri Feb 8 09:22:43 2008 -0800
uml: fix mm_context memory leak [ Spotted by Miklos ] Fix a memory leak in init_new_context. The struct page ** buffer allocated for install_special_mapping was never recorded, and thus leaked when the mm_struct was freed. Fix it by saving the pointer in mm_context_t and freeing it in arch_exit_mmap. Signed-off-by: Jeff Dike <[EMAIL PROTECTED]> Cc: Miklos Szeredi <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- arch/um/include/um_mmu.h | 1 + arch/um/kernel/skas/mmu.c | 5 +++++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/arch/um/include/um_mmu.h b/arch/um/include/um_mmu.h index 82865fc..f575ff9 100644 --- a/arch/um/include/um_mmu.h +++ b/arch/um/include/um_mmu.h @@ -13,6 +13,7 @@ typedef struct mm_context { struct mm_id id; struct uml_ldt ldt; + struct page **stub_pages; } mm_context_t; extern void __switch_mm(struct mm_id * mm_idp); diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index 78b3e9f..0cd9a7a 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -91,6 +91,8 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm) goto out_free; } + to_mm->stub_pages = NULL; + return 0; out_free: @@ -126,6 +128,7 @@ void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) pages[0] = virt_to_page(&__syscall_stub_start); pages[1] = virt_to_page(mm->context.id.stack); + mm->context.stub_pages = pages; /* dup_mmap already holds mmap_sem */ err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START, @@ -147,6 +150,8 @@ void arch_exit_mmap(struct mm_struct *mm) { pte_t *pte; + if (mm->context.stub_pages != NULL) + kfree(mm->context.stub_pages); pte = virt_to_pte(mm, STUB_CODE); if (pte != NULL) pte_clear(mm, STUB_CODE, pte); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html