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| author |   Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-04-15 23:21:11 +0200 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-04-15 23:42:21 +0200 |
| commit | 2c92ef8ff8d327797c1920ae7f938bcc6f3f7421 (patch) | |
| tree | 0f72d5bb46397d2b3615194beb4e597d673e6839 | |
| parent | MIPS: Fix access_ok() for the last byte of user space (diff) | |
| download | linux-dev-2c92ef8ff8d327797c1920ae7f938bcc6f3f7421.tar.xz linux-dev-2c92ef8ff8d327797c1920ae7f938bcc6f3f7421.zip | |
MIPS: Fix strnlen_user access check
Commit 04324f44cb69 ("MIPS: Remove get_fs/set_fs") changed the access_ok
for strnlen_user to check the whole range, which broke some callers
of strndup_user(). Restore the old behaviour and just check the first byte.
Fixes: 04324f44cb69 ("MIPS: Remove get_fs/set_fs")
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
| -rw-r--r-- | arch/mips/include/asm/uaccess.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index ab47e597656a..783fecce65c8 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -614,8 +614,8 @@ static inline long strnlen_user(const char __user *s, long n) { long res; - if (!access_ok(s, n)) - return -0; + if (!access_ok(s, 1)) + return 0; might_fault(); __asm__ __volatile__( |