From: Julien Grall Date: Tue, 10 May 2016 14:40:31 +0000 (+0100) Subject: arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f228b494e56d949be8d8ea09d4f973d1979201bf;p=linux-beck.git arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str The loop that browses the array compat_hwcap_str will stop when a NULL is encountered, however NULL is missing at the end of array. This will lead to overrun until a NULL is found somewhere in the following memory. In reality, this works out because the compat_hwcap2_str array tends to follow immediately in memory, and that *is* terminated correctly. Furthermore, the unsigned int compat_elf_hwcap is checked before printing each capability, so we end up doing the right thing because the size of the two arrays is less than 32. Still, this is an obvious mistake and should be fixed. Note for backporting: commit 12d11817eaafa414 ("arm64: Move /proc/cpuinfo handling code") moved this code in v4.4. Prior to that commit, the same change should be made in arch/arm64/kernel/setup.c. Fixes: 44b82b7700d0 "arm64: Fix up /proc/cpuinfo" Cc: # v3.19+ (but see note above prior to v4.4) Signed-off-by: Julien Grall Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 92189e2875f2..3808470486f3 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -87,7 +87,8 @@ static const char *const compat_hwcap_str[] = { "idivt", "vfpd32", "lpae", - "evtstrm" + "evtstrm", + NULL }; static const char *const compat_hwcap2_str[] = {