diff options
| author | Linus Torvalds <torvalds@home.osdl.org> | 2004-01-04 17:41:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@home.osdl.org> | 2004-01-04 17:41:13 -0800 |
| commit | 70faa195d4e1b6cddcc5c88987be1273eb8cab24 (patch) | |
| tree | dcf6ad2aa8ce84dd92143094c00ae6fe12e6b31e | |
| parent | e37d5b228334c3939b0447201a1870eb92a804ee (diff) | |
Don't allow mremap of zero-sized areas.
| -rw-r--r-- | mm/mremap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 0412a204cb69..ce523ef85555 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -315,6 +315,10 @@ unsigned long do_mremap(unsigned long addr, old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); + /* Don't allow the degenerate cases */ + if (!(old_len | new_len)) + goto out; + /* new_addr is only valid if MREMAP_FIXED is specified */ if (flags & MREMAP_FIXED) { if (new_addr & ~PAGE_MASK) |