From 03221702608c60b470fc86a23bdf4bc30e5bd59f Mon Sep 17 00:00:00 2001 From: Brian Pomerantz Date: Sun, 1 Apr 2007 23:49:41 -0700 Subject: [PATCH] fix page leak during core dump When the dump cannot occur most likely because of a full file system and the page to be written is the zero page, the call to page_cache_release() is missed. Signed-off-by: Brian Pomerantz Cc: Hugh Dickins Cc: Nick Piggin Cc: David Howells Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/binfmt_elf.c | 5 ++++- fs/binfmt_elf_fdpic.c | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index a2fceba7ef8e..9cc4f0a8aaae 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1704,7 +1704,10 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file) DUMP_SEEK(PAGE_SIZE); } else { if (page == ZERO_PAGE(addr)) { - DUMP_SEEK(PAGE_SIZE); + if (!dump_seek(file, PAGE_SIZE)) { + page_cache_release(page); + goto end_coredump; + } } else { void *kaddr; flush_cache_page(vma, addr, diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 47d6d49d1fb9..f3ddca4a387b 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -1480,8 +1480,8 @@ static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm, DUMP_SEEK(file->f_pos + PAGE_SIZE); } else if (page == ZERO_PAGE(addr)) { - DUMP_SEEK(file->f_pos + PAGE_SIZE); page_cache_release(page); + DUMP_SEEK(file->f_pos + PAGE_SIZE); } else { void *kaddr; -- cgit v1.2.3