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Fix uninitialised variable warning (from smatch) in the arm64 compat

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alignment fixup code.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Fix uninitialised variable warning (from smatch) in the arm64 compat
  alignment fixup code"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: compat: Work around uninitialized variable warning
This commit is contained in:
Linus Torvalds 2023-04-07 13:27:02 -07:00
commit d523dc7b16
1 changed files with 14 additions and 18 deletions
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32
arch/arm64/kernel/compat_alignment.c
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@ -314,36 +314,32 @@ int do_compat_alignment_fixup(unsigned long addr, struct pt_regs *regs)
int (*handler)(unsigned long addr, u32 instr, struct pt_regs *regs);
unsigned int type;
u32 instr = 0;
u16 tinstr = 0;
int isize = 4;
int thumb2_32b = 0;
int fault;
instrptr = instruction_pointer(regs);
if (compat_thumb_mode(regs)) {
__le16 __user *ptr = (__le16 __user *)(instrptr & ~1);
u16 tinstr, tinst2;
fault = alignment_get_thumb(regs, ptr, &tinstr);
if (!fault) {
if (IS_T32(tinstr)) {
/* Thumb-2 32-bit */
u16 tinst2;
fault = alignment_get_thumb(regs, ptr + 1, &tinst2);
instr = ((u32)tinstr << 16) | tinst2;
thumb2_32b = 1;
} else {
isize = 2;
instr = thumb2arm(tinstr);
}
if (alignment_get_thumb(regs, ptr, &tinstr))
return 1;
if (IS_T32(tinstr)) { /* Thumb-2 32-bit */
if (alignment_get_thumb(regs, ptr + 1, &tinst2))
return 1;
instr = ((u32)tinstr << 16) | tinst2;
thumb2_32b = 1;
} else {
isize = 2;
instr = thumb2arm(tinstr);
}
} else {
fault = alignment_get_arm(regs, (__le32 __user *)instrptr, &instr);
if (alignment_get_arm(regs, (__le32 __user *)instrptr, &instr))
return 1;
}
if (fault)
return 1;
switch (CODING_BITS(instr)) {
case 0x00000000: /* 3.13.4 load/store instruction extensions */
if (LDSTHD_I_BIT(instr))