| Message ID | 20210914121129.51451-5-joevt@shaw.ca |
|---|---|
| State | New |
| Headers | show |
| Series | [01/11] edid-decode: add more example EDIDs | expand |
On 14/09/2021 14:11, joevt wrote: Please always add a commit log here, even if it is just a copy of the subject. No need to do anything, I'll take care of it this time. Regards, Hans > Signed-off-by: Joe van Tunen <joevt@shaw.ca> > --- > parse-vtb-ext-block.cpp | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/parse-vtb-ext-block.cpp b/parse-vtb-ext-block.cpp > index 05d54f4..edfe887 100644 > --- a/parse-vtb-ext-block.cpp > +++ b/parse-vtb-ext-block.cpp > @@ -17,16 +17,21 @@ void edid_state::parse_vtb_ext_block(const unsigned char *x) > unsigned num_cvt = x[3]; > unsigned num_st = x[4]; > > + const unsigned char *y = x + 0x7f; > x += 5; > if (num_dtd) { > printf(" Detailed Timing Descriptors:\n"); > - for (unsigned i = 0; i < num_dtd; i++, x += 18) > + for (unsigned i = 0; i < num_dtd; i++, x += 18) { > + if (x + 18 > y) { fail("Not enough bytes remain for more DTBs in the VTB-EXT\n"); return; } > detailed_timings(" ", x, false); > + } > } > if (num_cvt) { > printf(" Coordinated Video Timings:\n"); > - for (unsigned i = 0; i < num_cvt; i++, x += 3) > + for (unsigned i = 0; i < num_cvt; i++, x += 3) { > + if (x + 3 > y) { fail("Not enough bytes remain for more CVTs in the VTB-EXT\n"); return; } > detailed_cvt_descriptor(" ", x, false); > + } > } > if (num_st) { > // Note: the VTB-EXT standard has a mistake in the example EDID > @@ -36,7 +41,9 @@ void edid_state::parse_vtb_ext_block(const unsigned char *x) > // > // The documentation itself is correct, though. > printf(" Standard Timings:\n"); > - for (unsigned i = 0; i < num_st; i++, x += 2) > + for (unsigned i = 0; i < num_st; i++, x += 2) { > + if (x + 2 > y) { fail("Not enough bytes remain for more STs in the VTB-EXT\n"); return; } > print_standard_timing(" ", x[0], x[1], true); > + } > } > } >
diff --git a/parse-vtb-ext-block.cpp b/parse-vtb-ext-block.cpp index 05d54f4..edfe887 100644 --- a/parse-vtb-ext-block.cpp +++ b/parse-vtb-ext-block.cpp @@ -17,16 +17,21 @@ void edid_state::parse_vtb_ext_block(const unsigned char *x) unsigned num_cvt = x[3]; unsigned num_st = x[4]; + const unsigned char *y = x + 0x7f; x += 5; if (num_dtd) { printf(" Detailed Timing Descriptors:\n"); - for (unsigned i = 0; i < num_dtd; i++, x += 18) + for (unsigned i = 0; i < num_dtd; i++, x += 18) { + if (x + 18 > y) { fail("Not enough bytes remain for more DTBs in the VTB-EXT\n"); return; } detailed_timings(" ", x, false); + } } if (num_cvt) { printf(" Coordinated Video Timings:\n"); - for (unsigned i = 0; i < num_cvt; i++, x += 3) + for (unsigned i = 0; i < num_cvt; i++, x += 3) { + if (x + 3 > y) { fail("Not enough bytes remain for more CVTs in the VTB-EXT\n"); return; } detailed_cvt_descriptor(" ", x, false); + } } if (num_st) { // Note: the VTB-EXT standard has a mistake in the example EDID @@ -36,7 +41,9 @@ void edid_state::parse_vtb_ext_block(const unsigned char *x) // // The documentation itself is correct, though. printf(" Standard Timings:\n"); - for (unsigned i = 0; i < num_st; i++, x += 2) + for (unsigned i = 0; i < num_st; i++, x += 2) { + if (x + 2 > y) { fail("Not enough bytes remain for more STs in the VTB-EXT\n"); return; } print_standard_timing(" ", x[0], x[1], true); + } } }
Signed-off-by: Joe van Tunen <joevt@shaw.ca> --- parse-vtb-ext-block.cpp | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)