diff options
| author | Maciej W. Rozycki <macro@imgtec.com> | 2016-06-21 20:12:00 +0100 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@imgtec.com> | 2016-06-21 23:00:01 +0100 |
| commit | 717ba204e06d88ed68441e236da3688a92cf054c (patch) | |
| tree | 6bfeb73efc1891684acba3d24cf8e33726e0e596 | |
| parent | 51f6035b9ec8b4a23d73bed6688804e5f595e1c2 (diff) | |
| download | gdb-717ba204e06d88ed68441e236da3688a92cf054c.zip gdb-717ba204e06d88ed68441e236da3688a92cf054c.tar.gz gdb-717ba204e06d88ed68441e236da3688a92cf054c.tar.bz2 | |
MIPS/GAS: Fix null pointer dereferences in R6 PC-relative relocation checks
Avoid segmentation faults in alignment checks made in `md_apply_fix' for
BFD_RELOC_MIPS_18_PCREL_S3 and BFD_RELOC_MIPS_19_PCREL_S2 relocations
caused by dereferencing `fixP->fx_addsy' which will be null if the
relocation processed has been fully resolved.
gas/
* config/tc-mips.c (md_apply_fix) <BFD_RELOC_MIPS_18_PCREL_S3>
<BFD_RELOC_MIPS_19_PCREL_S2>: Avoid null pointer dereferences
via `fixP->fx_addsy'.
| -rw-r--r-- | gas/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/config/tc-mips.c | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 45a5054..6ccbaa2 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,5 +1,11 @@ 2016-06-21 Maciej W. Rozycki <macro@imgtec.com> + * config/tc-mips.c (md_apply_fix) <BFD_RELOC_MIPS_18_PCREL_S3> + <BFD_RELOC_MIPS_19_PCREL_S2>: Avoid null pointer dereferences + via `fixP->fx_addsy'. + +2016-06-21 Maciej W. Rozycki <macro@imgtec.com> + * config/tc-mips.c (md_pcrel_from) <BFD_RELOC_MIPS_18_PCREL_S3>: Calculate relocation from the containing aligned doubleword. (tc_gen_reloc) <BFD_RELOC_MIPS_18_PCREL_S3>: Calculate the diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c index 74f7e00..c598806 100644 --- a/gas/config/tc-mips.c +++ b/gas/config/tc-mips.c @@ -15034,7 +15034,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) break; case BFD_RELOC_MIPS_18_PCREL_S3: - if ((S_GET_VALUE (fixP->fx_addsy) & 0x7) != 0) + if (fixP->fx_addsy && (S_GET_VALUE (fixP->fx_addsy) & 0x7) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access using misaligned symbol (%lx)"), (long) S_GET_VALUE (fixP->fx_addsy)); @@ -15050,7 +15050,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) if ((*valP & 0x3) != 0) as_bad_where (fixP->fx_file, fixP->fx_line, _("PC-relative access to misaligned address (%lx)"), - (long) (S_GET_VALUE (fixP->fx_addsy) + fixP->fx_offset)); + (long) *valP); gas_assert (!fixP->fx_done); break; |