From: Alexandr Andreev <aandreev@xxxxxxxxxx>
Add VERIFY_WRITE check in the beginning like compat_sys_getdents() (EINVAL vs
EFAULT).
Signed-off-by: Alexandr Andreev <aandreev@xxxxxxxxxx>
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/ia32/sys_ia32.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff -puN arch/ia64/ia32/sys_ia32.c~ia64-sync-compat-getdents-on-ia64-and-parisc arch/ia64/ia32/sys_ia32.c
--- a/arch/ia64/ia32/sys_ia32.c~ia64-sync-compat-getdents-on-ia64-and-parisc
+++ a/arch/ia64/ia32/sys_ia32.c
@@ -1267,6 +1267,10 @@ sys32_getdents (unsigned int fd, struct
struct getdents32_callback buf;
int error;
+ error = -EFAULT;
+ if (!access_ok(VERIFY_WRITE, dirent, count))
+ goto out;
+
error = -EBADF;
file = fget(fd);
if (!file)
@@ -1283,10 +1287,10 @@ sys32_getdents (unsigned int fd, struct
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
- error = -EINVAL;
if (put_user(file->f_pos, &lastdirent->d_off))
- goto out_putf;
- error = count - buf.count;
+ error = -EFAULT;
+ else
+ error = count - buf.count;
}
out_putf:
_
-
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